diff --git a/.travis.yml b/.travis.yml
index 13260c2..a5a5918 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,13 +7,6 @@ node_js:
   - "10"
   - "9"
   - "8"
-  - "6"
-  - "5"
-  - "5.1"
-  - "4"
-  - "4.2"
-  - "4.1"
-  - "4.0"
 
 addons:
   apt:
diff --git a/package-lock.json b/package-lock.json
index 065c8a3..1133536 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -28,19 +28,21 @@
       }
     },
     "ajv": {
-      "version": "4.11.8",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-4.11.8.tgz",
-      "integrity": "sha1-gv+wKynmYq5TvcIK8VlHcGc5xTY=",
+      "version": "5.5.2",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.5.2.tgz",
+      "integrity": "sha1-c7Xuyj+rZT49P5Qis0GtQiBdyWU=",
       "dev": true,
       "requires": {
         "co": "4.6.0",
-        "json-stable-stringify": "1.0.1"
+        "fast-deep-equal": "1.1.0",
+        "fast-json-stable-stringify": "2.0.0",
+        "json-schema-traverse": "0.3.1"
       }
     },
     "ajv-keywords": {
-      "version": "1.5.1",
-      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-1.5.1.tgz",
-      "integrity": "sha1-MU3QpLM2j609/NxU7eYXG4htrzw=",
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-2.1.1.tgz",
+      "integrity": "sha1-YXmX/F9gV2iUxDX5QNgZ4TW4B2I=",
       "dev": true
     },
     "align-text": {
@@ -61,9 +63,9 @@
       "dev": true
     },
     "ansi-escapes": {
-      "version": "1.4.0",
-      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-1.4.0.tgz",
-      "integrity": "sha1-06ioOzGapneTZisT52HHkRQiMG4=",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.1.0.tgz",
+      "integrity": "sha512-UgAb8H9D41AQnu/PbWlCofQVcnV4Gs2bBJi9eZPxfU/hgglFh3SMDMENRIqdr7H6XFnXdoknctFByVsCOotTVw==",
       "dev": true
     },
     "ansi-regex": {
@@ -123,6 +125,36 @@
         "chalk": "1.1.3",
         "esutils": "2.0.2",
         "js-tokens": "3.0.2"
+      },
+      "dependencies": {
+        "chalk": {
+          "version": "1.1.3",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+          "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "2.2.1",
+            "escape-string-regexp": "1.0.5",
+            "has-ansi": "2.0.0",
+            "strip-ansi": "3.0.1",
+            "supports-color": "2.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "2.1.1"
+          }
+        },
+        "supports-color": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
+          "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
+          "dev": true
+        }
       }
     },
     "balanced-match": {
@@ -136,42 +168,39 @@
       "resolved": "https://registry.npmjs.org/bindings/-/bindings-1.3.0.tgz",
       "integrity": "sha512-DpLh5EzMR2kzvX1KIlVC0VkC3iZtHKTgdtZ0a3pglBZdaQFjt5S9g9xd1lE+YvXyfd6mtCeRnrUfOLYiTMlNSw=="
     },
+    "boom": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/boom/-/boom-7.2.0.tgz",
+      "integrity": "sha1-K/8kpVVldn/ehp7ICDF+sQxI6WY=",
+      "dev": true,
+      "requires": {
+        "hoek": "5.0.3"
+      },
+      "dependencies": {
+        "hoek": {
+          "version": "5.0.3",
+          "resolved": "https://registry.npmjs.org/hoek/-/hoek-5.0.3.tgz",
+          "integrity": "sha512-Bmr56pxML1c9kU+NS51SMFkiVQAb+9uFfXwyqR2tn4w2FPvmPt65eZ9aCcEfRXd9G74HkZnILC6p967pED4aiw==",
+          "dev": true
+        }
+      }
+    },
     "bossy": {
-      "version": "3.0.4",
-      "resolved": "https://registry.npmjs.org/bossy/-/bossy-3.0.4.tgz",
-      "integrity": "sha1-+a6fJugbQaMY9O4Ng2huSlwlB7k=",
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/bossy/-/bossy-4.0.1.tgz",
+      "integrity": "sha512-IrXZdXnDrjfk9ZVtnnmehlcTGK/KRqUJuNZJteMGU2/cJdXC6yWf2yhkAAbAgjOTsJJHXdlYloTeFH1ZgRNllw==",
       "dev": true,
       "requires": {
-        "hoek": "4.2.1",
-        "joi": "10.6.0"
+        "boom": "7.2.0",
+        "hoek": "5.0.3",
+        "joi": "13.1.2"
       },
       "dependencies": {
-        "isemail": {
-          "version": "2.2.1",
-          "resolved": "https://registry.npmjs.org/isemail/-/isemail-2.2.1.tgz",
-          "integrity": "sha1-A1PT2aYpUQgMJiwqoKQrjqjp4qY=",
+        "hoek": {
+          "version": "5.0.3",
+          "resolved": "https://registry.npmjs.org/hoek/-/hoek-5.0.3.tgz",
+          "integrity": "sha512-Bmr56pxML1c9kU+NS51SMFkiVQAb+9uFfXwyqR2tn4w2FPvmPt65eZ9aCcEfRXd9G74HkZnILC6p967pED4aiw==",
           "dev": true
-        },
-        "joi": {
-          "version": "10.6.0",
-          "resolved": "https://registry.npmjs.org/joi/-/joi-10.6.0.tgz",
-          "integrity": "sha512-hBF3LcqyAid+9X/pwg+eXjD2QBZI5eXnBFJYaAkH4SK3mp9QSRiiQnDYlmlz5pccMvnLcJRS4whhDOTCkmsAdQ==",
-          "dev": true,
-          "requires": {
-            "hoek": "4.2.1",
-            "isemail": "2.2.1",
-            "items": "2.1.1",
-            "topo": "2.0.2"
-          }
-        },
-        "topo": {
-          "version": "2.0.2",
-          "resolved": "https://registry.npmjs.org/topo/-/topo-2.0.2.tgz",
-          "integrity": "sha1-zVYVdSU5BXwNwEkaYhw7xvvh0YI=",
-          "dev": true,
-          "requires": {
-            "hoek": "4.2.1"
-          }
         }
       }
     },
@@ -225,18 +254,42 @@
       }
     },
     "chalk": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
-      "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.1.tgz",
+      "integrity": "sha512-ObN6h1v2fTJSmUXoS3nMQ92LbDK9be4TV+6G+omQlGJFdcUX5heKi1LZ1YnRMIgwTLEj3E24bT6tYni50rlCfQ==",
       "dev": true,
       "requires": {
-        "ansi-styles": "2.2.1",
+        "ansi-styles": "3.2.1",
         "escape-string-regexp": "1.0.5",
-        "has-ansi": "2.0.0",
-        "strip-ansi": "3.0.1",
-        "supports-color": "2.0.0"
+        "supports-color": "5.4.0"
+      },
+      "dependencies": {
+        "ansi-styles": {
+          "version": "3.2.1",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+          "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+          "dev": true,
+          "requires": {
+            "color-convert": "1.9.1"
+          }
+        },
+        "supports-color": {
+          "version": "5.4.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.4.0.tgz",
+          "integrity": "sha512-zjaXglF5nnWpsq470jSv6P9DwPvgLkuapYmfDm3JWOm0vkNTVF2tI4UrN2r6jH1qM/uc/WtxYY1hYoA2dOKj5w==",
+          "dev": true,
+          "requires": {
+            "has-flag": "3.0.0"
+          }
+        }
       }
     },
+    "chardet": {
+      "version": "0.4.2",
+      "resolved": "https://registry.npmjs.org/chardet/-/chardet-0.4.2.tgz",
+      "integrity": "sha1-tUc7M9yXxCTl2Y3IfVXU2KKci/I=",
+      "dev": true
+    },
     "circular-json": {
       "version": "0.3.3",
       "resolved": "https://registry.npmjs.org/circular-json/-/circular-json-0.3.3.tgz",
@@ -244,12 +297,12 @@
       "dev": true
     },
     "cli-cursor": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-1.0.2.tgz",
-      "integrity": "sha1-ZNo/fValRBLll5S9Ytw1KV6PKYc=",
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-2.1.0.tgz",
+      "integrity": "sha1-s12sN2R5+sw+lHR9QdDQ9SOP/LU=",
       "dev": true,
       "requires": {
-        "restore-cursor": "1.0.1"
+        "restore-cursor": "2.0.0"
       }
     },
     "cli-width": {
@@ -294,10 +347,19 @@
         "hoek": "4.2.1"
       }
     },
-    "code-point-at": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
-      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
+    "color-convert": {
+      "version": "1.9.1",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.1.tgz",
+      "integrity": "sha512-mjGanIiwQJskCC18rPR6OmrZ6fm2Lc7PeGFYwCmy5J34wC6F1PzdGL6xeMfmgicfYcNLGuVFA3WzXtIDCQSZxQ==",
+      "dev": true,
+      "requires": {
+        "color-name": "1.1.3"
+      }
+    },
+    "color-name": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
+      "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=",
       "dev": true
     },
     "concat-map": {
@@ -314,7 +376,7 @@
       "requires": {
         "buffer-from": "1.0.0",
         "inherits": "2.0.3",
-        "readable-stream": "2.3.5",
+        "readable-stream": "2.3.6",
         "typedarray": "0.0.6"
       }
     },
@@ -324,19 +386,21 @@
       "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
       "dev": true
     },
-    "d": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/d/-/d-1.0.0.tgz",
-      "integrity": "sha1-dUu1v+VUUdpppYuU1F9MWwRi1Y8=",
+    "cross-spawn": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-5.1.0.tgz",
+      "integrity": "sha1-6L0O/uWPz/b4+UUQoKVUu/ojVEk=",
       "dev": true,
       "requires": {
-        "es5-ext": "0.10.41"
+        "lru-cache": "4.1.3",
+        "shebang-command": "1.2.0",
+        "which": "1.3.0"
       }
     },
     "debug": {
-      "version": "2.6.9",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
-      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
+      "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
       "dev": true,
       "requires": {
         "ms": "2.0.0"
@@ -377,84 +441,12 @@
       "dev": true
     },
     "doctrine": {
-      "version": "1.5.0",
-      "resolved": "https://registry.npmjs.org/doctrine/-/doctrine-1.5.0.tgz",
-      "integrity": "sha1-N53Ocw9hZvds76TmcHoVmwLFpvo=",
-      "dev": true,
-      "requires": {
-        "esutils": "2.0.2",
-        "isarray": "1.0.0"
-      }
-    },
-    "es5-ext": {
-      "version": "0.10.41",
-      "resolved": "https://registry.npmjs.org/es5-ext/-/es5-ext-0.10.41.tgz",
-      "integrity": "sha512-MYK02wXfwTMie5TEJWPolgOsXEmz7wKCQaGzgmRjZOoV6VLG8I5dSv2bn6AOClXhK64gnSQTQ9W9MKvx87J4gw==",
-      "dev": true,
-      "requires": {
-        "es6-iterator": "2.0.3",
-        "es6-symbol": "3.1.1",
-        "next-tick": "1.0.0"
-      }
-    },
-    "es6-iterator": {
-      "version": "2.0.3",
-      "resolved": "https://registry.npmjs.org/es6-iterator/-/es6-iterator-2.0.3.tgz",
-      "integrity": "sha1-p96IkUGgWpSwhUQDstCg+/qY87c=",
-      "dev": true,
-      "requires": {
-        "d": "1.0.0",
-        "es5-ext": "0.10.41",
-        "es6-symbol": "3.1.1"
-      }
-    },
-    "es6-map": {
-      "version": "0.1.5",
-      "resolved": "https://registry.npmjs.org/es6-map/-/es6-map-0.1.5.tgz",
-      "integrity": "sha1-kTbgUD3MBqMBaQ8LsU/042TpSfA=",
-      "dev": true,
-      "requires": {
-        "d": "1.0.0",
-        "es5-ext": "0.10.41",
-        "es6-iterator": "2.0.3",
-        "es6-set": "0.1.5",
-        "es6-symbol": "3.1.1",
-        "event-emitter": "0.3.5"
-      }
-    },
-    "es6-set": {
-      "version": "0.1.5",
-      "resolved": "https://registry.npmjs.org/es6-set/-/es6-set-0.1.5.tgz",
-      "integrity": "sha1-0rPsXU2ADO2BjbU40ol02wpzzLE=",
-      "dev": true,
-      "requires": {
-        "d": "1.0.0",
-        "es5-ext": "0.10.41",
-        "es6-iterator": "2.0.3",
-        "es6-symbol": "3.1.1",
-        "event-emitter": "0.3.5"
-      }
-    },
-    "es6-symbol": {
-      "version": "3.1.1",
-      "resolved": "https://registry.npmjs.org/es6-symbol/-/es6-symbol-3.1.1.tgz",
-      "integrity": "sha1-vwDvT9q2uhtG7Le2KbTH7VcVzHc=",
-      "dev": true,
-      "requires": {
-        "d": "1.0.0",
-        "es5-ext": "0.10.41"
-      }
-    },
-    "es6-weak-map": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/es6-weak-map/-/es6-weak-map-2.0.2.tgz",
-      "integrity": "sha1-XjqzIlH/0VOKH45f+hNXdy+S2W8=",
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/doctrine/-/doctrine-2.1.0.tgz",
+      "integrity": "sha512-35mSku4ZXK0vfCuHEDAwt55dg2jNajHZ1odvF+8SSr82EsZY4QmXfuWso8oEd8zRhVObSN18aM0CjSdoBX7zIw==",
       "dev": true,
       "requires": {
-        "d": "1.0.0",
-        "es5-ext": "0.10.41",
-        "es6-iterator": "2.0.3",
-        "es6-symbol": "3.1.1"
+        "esutils": "2.0.2"
       }
     },
     "escape-string-regexp": {
@@ -463,64 +455,56 @@
       "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=",
       "dev": true
     },
-    "escope": {
-      "version": "3.6.0",
-      "resolved": "https://registry.npmjs.org/escope/-/escope-3.6.0.tgz",
-      "integrity": "sha1-4Bl16BJ4GhY6ba392AOY3GTIicM=",
-      "dev": true,
-      "requires": {
-        "es6-map": "0.1.5",
-        "es6-weak-map": "2.0.2",
-        "esrecurse": "4.2.1",
-        "estraverse": "4.2.0"
-      }
-    },
     "eslint": {
-      "version": "3.13.1",
-      "resolved": "https://registry.npmjs.org/eslint/-/eslint-3.13.1.tgz",
-      "integrity": "sha1-Vk0mRrXv3thd+WmFMy7dkaI7/yU=",
+      "version": "4.19.1",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-4.19.1.tgz",
+      "integrity": "sha512-bT3/1x1EbZB7phzYu7vCr1v3ONuzDtX8WjuM9c0iYxe+cq+pwcKEoQjl7zd3RpC6YOLgnSy3cTN58M2jcoPDIQ==",
       "dev": true,
       "requires": {
+        "ajv": "5.5.2",
         "babel-code-frame": "6.26.0",
-        "chalk": "1.1.3",
+        "chalk": "2.4.1",
         "concat-stream": "1.6.2",
-        "debug": "2.6.9",
-        "doctrine": "1.5.0",
-        "escope": "3.6.0",
+        "cross-spawn": "5.1.0",
+        "debug": "3.1.0",
+        "doctrine": "2.1.0",
+        "eslint-scope": "3.7.1",
+        "eslint-visitor-keys": "1.0.0",
         "espree": "3.5.4",
-        "estraverse": "4.2.0",
+        "esquery": "1.0.1",
         "esutils": "2.0.2",
         "file-entry-cache": "2.0.0",
+        "functional-red-black-tree": "1.0.1",
         "glob": "7.1.2",
-        "globals": "9.18.0",
-        "ignore": "3.3.7",
+        "globals": "11.5.0",
+        "ignore": "3.3.8",
         "imurmurhash": "0.1.4",
-        "inquirer": "0.12.0",
-        "is-my-json-valid": "2.17.2",
+        "inquirer": "3.3.0",
         "is-resolvable": "1.1.0",
         "js-yaml": "3.11.0",
-        "json-stable-stringify": "1.0.1",
+        "json-stable-stringify-without-jsonify": "1.0.1",
         "levn": "0.3.0",
-        "lodash": "4.17.5",
+        "lodash": "4.17.10",
+        "minimatch": "3.0.4",
         "mkdirp": "0.5.1",
         "natural-compare": "1.4.0",
         "optionator": "0.8.2",
         "path-is-inside": "1.0.2",
-        "pluralize": "1.2.1",
-        "progress": "1.1.8",
+        "pluralize": "7.0.0",
+        "progress": "2.0.0",
+        "regexpp": "1.1.0",
         "require-uncached": "1.0.3",
-        "shelljs": "0.7.8",
-        "strip-bom": "3.0.0",
+        "semver": "5.5.0",
+        "strip-ansi": "4.0.0",
         "strip-json-comments": "2.0.1",
-        "table": "3.8.3",
-        "text-table": "0.2.0",
-        "user-home": "2.0.0"
+        "table": "4.0.2",
+        "text-table": "0.2.0"
       }
     },
     "eslint-config-hapi": {
-      "version": "10.1.0",
-      "resolved": "https://registry.npmjs.org/eslint-config-hapi/-/eslint-config-hapi-10.1.0.tgz",
-      "integrity": "sha512-tAUedyvZla1qKt6jhOx7mj5tYDVCwdSyImpEK7wk/A/atKUjg18aHUK6Q6qWWM6rq21I1F/A8JAhIpkk0SvFMQ==",
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-          }
-        },
-        "strip-ansi": {
-          "version": "4.0.0",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
-          "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
-          "dev": true,
-          "requires": {
-            "ansi-regex": "3.0.0"
-          }
         }
       }
     },
+    "table": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/table/-/table-4.0.2.tgz",
+      "integrity": "sha512-UUkEAPdSGxtRpiV9ozJ5cMTtYiqz7Ni1OGqLXRCynrvzdtR1p+cfOWe2RJLwvUG8hNanaSRjecIqwOjqeatDsA==",
+      "dev": true,
+      "requires": {
+        "ajv": "5.5.2",
+        "ajv-keywords": "2.1.1",
+        "chalk": "2.4.1",
+        "lodash": "4.17.10",
+        "slice-ansi": "1.0.0",
+        "string-width": "2.1.1"
+      }
+    },
     "text-table": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
@@ -5343,6 +1496,15 @@
       "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
       "dev": true
     },
+    "tmp": {
+      "version": "0.0.33",
+      "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
+      "integrity": "sha512-jRCJlojKnZ3addtTOjdIqoRuPEKBvNXcGYqzO6zWZX8KfKEpnGY5jfggJQ3EjKuu8D4bJRr0y+cYJFmYbImXGw==",
+      "dev": true,
+      "requires": {
+        "os-tmpdir": "1.0.2"
+      }
+    },
     "topo": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/topo/-/topo-3.0.0.tgz",
@@ -5401,21 +1563,27 @@
       "dev": true,
       "optional": true
     },
-    "user-home": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/user-home/-/user-home-2.0.0.tgz",
-      "integrity": "sha1-nHC/2Babwdy/SGBODwS4tJzenp8=",
-      "dev": true,
-      "requires": {
-        "os-homedir": "1.0.2"
-      }
-    },
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
       "dev": true
     },
+    "which": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/which/-/which-1.3.0.tgz",
+      "integrity": "sha512-xcJpopdamTuY5duC/KnTTNBraPK54YwpenP4lzxU8H91GudWpFv38u0CKjclE1Wi2EH2EDz5LRcHcKbCIzqGyg==",
+      "dev": true,
+      "requires": {
+        "isexe": "2.0.0"
+      }
+    },
+    "will-call": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/will-call/-/will-call-1.0.1.tgz",
+      "integrity": "sha512-1hEeV8SfBYhNRc/bNXeQfyUBX8Dl9SCYME3qXh99iZP9wJcnhnlBsoBw8Y0lXVZ3YuPsoxImTzBiol1ouNR/hg==",
+      "dev": true
+    },
     "window-size": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.1.0.tgz",
@@ -5444,10 +1612,10 @@
         "mkdirp": "0.5.1"
       }
     },
-    "xtend": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
-      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
+    "yallist": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
+      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
       "dev": true
     },
     "yargs": {
diff --git a/package.json b/package.json
index be83787..c6f7300 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,6 @@
   },
   "devDependencies": {
     "code": "^3.0.2",
-    "lab": "11.x.x"
+    "lab": "15.x.x"
   }
 }
diff --git a/test/test.js b/test/test.js
index cabd26b..1e884a4 100644
--- a/test/test.js
+++ b/test/test.js
@@ -19,7 +19,7 @@ var internals = {};
 
 describe('xml2json', function () {
 
-    it('converts with array-notation', function (done) {
+    it('converts with array-notation', function () {
 
         var xml = internals.readFixture('array-notation.xml');
         var result = parser.toJson(xml, { arrayNotation: true });
@@ -27,10 +27,10 @@ describe('xml2json', function () {
 
         expect(result).to.equal(json);
 
-        done();
+        return Promise.resolve()
     });
 
-    it('coerces', function (done) {
+    it('coerces', function () {
 
         var xml = internals.readFixture('coerce.xml');
         var result = parser.toJson(xml, { coerce: false });
@@ -38,10 +38,10 @@ describe('xml2json', function () {
 
         expect(result + '\n').to.equal(json);
 
-        done();
+        return Promise.resolve();
     });
 
-    it('handles domain', function (done) {
+    it('handles domain', function () {
 
         var xml = internals.readFixture('domain.xml');
         var result = parser.toJson(xml, { coerce: false });
@@ -49,10 +49,10 @@ describe('xml2json', function () {
 
         expect(result + '\n').to.equal(json);
 
-        done();
+        return Promise.resolve();
     });
 
-    it('does large file', function (done) {
+    it('does large file', function () {
 
         var xml = internals.readFixture('large.xml');
         var result = parser.toJson(xml, { coerce: false, trim: true, sanitize: false });
@@ -60,10 +60,10 @@ describe('xml2json', function () {
 
         expect(result + '\n').to.equal(json);
 
-        done();
+        return Promise.resolve();
     });
 
-    it('handles reorder', function (done) {
+    it('handles reorder', function () {
 
         var xml = internals.readFixture('reorder.xml');
         var result = parser.toJson(xml, {});
@@ -71,10 +71,10 @@ describe('xml2json', function () {
 
         expect(result).to.equal(json);
 
-        done();
+        return Promise.resolve();
     });
 
-    it('handles text with space', function (done) {
+    it('handles text with space', function () {
 
         var xml = internals.readFixture('spacetext.xml');
         var result = parser.toJson(xml, { coerce: false, trim: false });
@@ -82,10 +82,10 @@ describe('xml2json', function () {
 
         expect(result).to.equal(json);
 
-        done();
+        return Promise.resolve();
     });
 
-    it('does xmlsanitize', function (done) {
+    it('does xmlsanitize', function () {
 
         var xml = internals.readFixture('xmlsanitize.xml');
         var result = parser.toJson(xml, {sanitize: true});
@@ -93,10 +93,10 @@ describe('xml2json', function () {
 
         expect(result).to.equal(json);
 
-        done();
+        return Promise.resolve();
     });
 
-    it('does xmlsanitize of text', function (done) {
+    it('does xmlsanitize of text', function () {
 
         var xml = internals.readFixture('xmlsanitize2.xml');
         var result = parser.toJson(xml, {sanitize: true, reversible: true});
@@ -104,10 +104,10 @@ describe('xml2json', function () {
 
         expect(result).to.equal(json);
 
-        done();
+        return Promise.resolve();
     });
 
-    it('does json unsanitize', function (done) {
+    it('does json unsanitize', function () {
 
         var json = internals.readFixture('xmlsanitize.json');
         var result = parser.toXml(json, {sanitize: true});
@@ -115,10 +115,10 @@ describe('xml2json', function () {
 
         expect(result).to.equal(xml);
 
-        done();
+        return Promise.resolve();
     });
 
-    it('does json unsanitize of text', function (done) {
+    it('does json unsanitize of text', function () {
 
         var json = internals.readFixture('xmlsanitize2.json');
         var result = parser.toXml(json, {sanitize: true});
@@ -126,10 +126,10 @@ describe('xml2json', function () {
 
         expect(result).to.equal(xml);
 
-        done();
+        return Promise.resolve();
     });
 
-    it('does doesnt double sanitize', function (done) {
+    it('does doesnt double sanitize', function () {
 
         var json = internals.readFixture('xmlsanitize3.json');
         var result = parser.toXml(json, {sanitize: true});
@@ -137,29 +137,29 @@ describe('xml2json', function () {
 
         expect(result).to.equal(xml);
 
-        done();
+        return Promise.resolve();
     });
 
-    it('does doesnt double unsanitize', function (done) {
+    it('does doesnt double unsanitize', function () {
 
         var xml = internals.readFixture('xmlsanitize3.xml');
         var result = parser.toJson(xml, {sanitize: true, reversible: true});
         var json = internals.readFixture('xmlsanitize3.json');
 
         expect(result).to.equal(json);
-        done();
+        return Promise.resolve();
     });
 
-    it('converts with forceArrays', function(done) {
+    it('converts with forceArrays', function() {
         var xml = internals.readFixture('forceArray.xml');
         var result = parser.toJson(xml, {arrayNotation: ['drivers', 'vehicles']});
         var json = internals.readFixture('forceArray.json');
 
         expect(result).to.equal(json);
-        done();
+        return Promise.resolve();
     });
 
-    it('throws error on bad options', function (done) {
+    it('throws error on bad options', function () {
 
         var throws = function() {
 
@@ -167,7 +167,7 @@ describe('xml2json', function () {
         };
 
         expect(throws).to.throw();
-        done();
+        return Promise.resolve();
     });
 
     describe('coercion', function () {
@@ -175,7 +175,7 @@ describe('xml2json', function () {
         var file = __dirname + '/fixtures/coerce.xml';
         var data = fs.readFileSync(file);
 
-        it('works with coercion', function(done) {
+        it('works with coercion', function() {
 
             // With coercion
             var result = parser.toJson(data, {reversible: true, coerce: true, object: true});
@@ -185,10 +185,10 @@ describe('xml2json', function () {
             expect(result.itemRecord.value[2].moneyValue['$t']).to.equal(104.95);
             expect(result.itemRecord.value[2].moneyValue.text).to.equal(123.45);
             expect(result.itemRecord.value[8].text['$t']).to.equal(42.42);
-            done();
+            return Promise.resolve();
         });
 
-        it('works without coercion', function(done) {
+        it('works without coercion', function() {
 
             var result = parser.toJson(data, {reversible: true, coerce: false, object: true});
             expect(result.itemRecord.value[0].longValue['$t']).to.equal('12345');
@@ -197,10 +197,10 @@ describe('xml2json', function () {
             expect(result.itemRecord.value[2].moneyValue['$t']).to.equal('104.95');
             expect(result.itemRecord.value[2].moneyValue.text).to.equal('123.45');
             expect(result.itemRecord.value[8].text['$t']).to.equal('42.42');
-            done();
+            return Promise.resolve();
         });
 
-        it('works with coercion as an optional object', function(done) {
+        it('works with coercion as an optional object', function() {
 
             var result = parser.toJson(data, {reversible: true, coerce: {text:String}, object: true});
             expect(result.itemRecord.value[0].longValue['$t']).to.equal(12345);
@@ -209,13 +209,13 @@ describe('xml2json', function () {
             expect(result.itemRecord.value[2].moneyValue['$t']).to.equal(104.95);
             expect(result.itemRecord.value[2].moneyValue.text).to.equal('123.45');
             expect(result.itemRecord.value[8].text['$t']).to.equal('42.42');
-            done();
+            return Promise.resolve();
         });
     })
 
     describe('alternateTextNode', function () {
 
-        it('A1: defaults without the option being defined', function(done) {
+        it('A1: defaults without the option being defined', function() {
 
             var xml = internals.readFixture('alternate-text-node-A.xml');
             var result = parser.toJson(xml, {reversible: true});
@@ -223,10 +223,10 @@ describe('xml2json', function () {
 
             expect(result).to.equal(json);
 
-            done();
+            return Promise.resolve();
         });
 
-        it('A2: defaults with option as false', function(done) {
+        it('A2: defaults with option as false', function() {
 
             var xml = internals.readFixture('alternate-text-node-A.xml');
             var result = parser.toJson(xml, {alternateTextNode: false, reversible: true});
@@ -234,11 +234,11 @@ describe('xml2json', function () {
 
             expect(result).to.equal(json);
 
-            done();
+            return Promise.resolve();
         });
 
 
-        it('B: uses alternate text node with option as true', function(done) {
+        it('B: uses alternate text node with option as true', function() {
 
             var xml = internals.readFixture('alternate-text-node-A.xml');
             var result = parser.toJson(xml, {alternateTextNode: true, reversible: true});
@@ -246,10 +246,10 @@ describe('xml2json', function () {
 
             expect(result).to.equal(json);
 
-            done();
+            return Promise.resolve();
         });
 
-        it('C: overrides text node with option as "xx" string', function(done) {
+        it('C: overrides text node with option as "xx" string', function() {
 
             var xml = internals.readFixture('alternate-text-node-A.xml');
             var result = parser.toJson(xml, {alternateTextNode: "xx", reversible: true});
@@ -257,10 +257,10 @@ describe('xml2json', function () {
 
             expect(result).to.equal(json);
 
-            done();
+            return Promise.resolve();
         });
 
-        it('D: double check sanatize and trim', function (done) {
+        it('D: double check sanatize and trim', function () {
 
             var xml = internals.readFixture('alternate-text-node-D.xml');
             var result = parser.toJson(xml, {alternateTextNode: "zz", sanitize: true, trim: true, reversible: true});
@@ -268,7 +268,7 @@ describe('xml2json', function () {
 
             expect(result).to.equal(json);
 
-            done();
+            return Promise.resolve();
         });
 
     })
@@ -277,7 +277,7 @@ describe('xml2json', function () {
 
 describe('json2xml', function () {
 
-    it('converts domain to json', function (done) {
+    it('converts domain to json', function () {
 
         var json = internals.readFixture('domain-reversible.json');
         var result = parser.toXml(json);
@@ -285,10 +285,10 @@ describe('json2xml', function () {
 
         expect(result+'\n').to.equal(xml);
 
-        done();
+        return Promise.resolve();
     });
 
-    it('works with array notation', function (done) {
+    it('works with array notation', function () {
 
         var xml = internals.readFixture('array-notation.xml');
         var expectedJson = JSON.parse( internals.readFixture('array-notation.json') );
@@ -297,12 +297,12 @@ describe('json2xml', function () {
 
         expect(json).to.equal(expectedJson);
 
-        done();
+        return Promise.resolve();
     });
 
     describe('ignore null', function () {
 
-        it('ignore null properties {ignoreNull: true}', function (done) {
+        it('ignore null properties {ignoreNull: true}', function () {
 
             var json = JSON.parse( internals.readFixture('null-properties.json') );
             var expectedXml = internals.readFixture('null-properties-ignored.xml');
@@ -310,10 +310,10 @@ describe('json2xml', function () {
             var xml = parser.toXml(json, {ignoreNull: true});
             expect(xml).to.equal(expectedXml);
 
-            done();
+            return Promise.resolve();
         });
 
-        it('don\'t ignore null properties (default)', function (done) {
+        it('don\'t ignore null properties (default)', function () {
 
             var json = JSON.parse( internals.readFixture('null-properties.json') );
             var expectedXml = internals.readFixture('null-properties-not-ignored.xml');
@@ -321,7 +321,7 @@ describe('json2xml', function () {
             var xml = parser.toXml(json);
             expect(xml).to.equal(expectedXml);
 
-            done();
+            return Promise.resolve();
         });
 
     });