diff --git a/Pipfile.lock b/Pipfile.lock
index 6ea05fe..c1986b6 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -28,17 +28,17 @@
         },
         "atomicwrites": {
             "hashes": [
-                "sha256:0312ad34fcad8fac3704d441f7b317e50af620823353ec657a53e981f92920c0",
-                "sha256:ec9ae8adaae229e4f8446952d204a3e4b5fdd2d099f9be3aaf556120135fb3ee"
+                "sha256:6d1784dea7c0c8d4a5172b6c620f40b6e4cbfdf96d783691f2e1302a7b88e197",
+                "sha256:ae70396ad1a434f9c7046fd2dd196fc04b12f9e91ffb859164193be8b6168a7a"
             ],
-            "version": "==1.2.1"
+            "version": "==1.4.0"
         },
         "attrs": {
             "hashes": [
-                "sha256:10cbf6e27dbce8c30807caf056c8eb50917e0eaafe86347671b57254006c3e69",
-                "sha256:ca4be454458f9dec299268d472aaa5a11f67a4ff70093396e1ceae9c76cf4bbb"
+                "sha256:31b2eced602aa8423c2aea9c76a724617ed67cf9513173fd3a4f03e3a929c7e6",
+                "sha256:832aa3cde19744e49938b91fea06d69ecb9e649c93ba974535d08ad92164f700"
             ],
-            "version": "==18.2.0"
+            "version": "==20.3.0"
         },
         "certifi": {
             "hashes": [
@@ -57,39 +57,60 @@
         },
         "coverage": {
             "hashes": [
-                "sha256:09e47c529ff77bf042ecfe858fb55c3e3eb97aac2c87f0349ab5a7efd6b3939f",
-                "sha256:0a1f9b0eb3aa15c990c328535655847b3420231af299386cfe5efc98f9c250fe",
-                "sha256:0cc941b37b8c2ececfed341444a456912e740ecf515d560de58b9a76562d966d",
-                "sha256:10e8af18d1315de936d67775d3a814cc81d0747a1a0312d84e27ae5610e313b0",
-                "sha256:1b4276550b86caa60606bd3572b52769860a81a70754a54acc8ba789ce74d607",
-                "sha256:1e8a2627c48266c7b813975335cfdea58c706fe36f607c97d9392e61502dc79d",
-                "sha256:2b224052bfd801beb7478b03e8a66f3f25ea56ea488922e98903914ac9ac930b",
-                "sha256:447c450a093766744ab53bf1e7063ec82866f27bcb4f4c907da25ad293bba7e3",
-                "sha256:46101fc20c6f6568561cdd15a54018bb42980954b79aa46da8ae6f008066a30e",
-                "sha256:4710dc676bb4b779c4361b54eb308bc84d64a2fa3d78e5f7228921eccce5d815",
-                "sha256:510986f9a280cd05189b42eee2b69fecdf5bf9651d4cd315ea21d24a964a3c36",
-                "sha256:5535dda5739257effef56e49a1c51c71f1d37a6e5607bb25a5eee507c59580d1",
-                "sha256:5a7524042014642b39b1fcae85fb37556c200e64ec90824ae9ecf7b667ccfc14",
-                "sha256:5f55028169ef85e1fa8e4b8b1b91c0b3b0fa3297c4fb22990d46ff01d22c2d6c",
-                "sha256:6694d5573e7790a0e8d3d177d7a416ca5f5c150742ee703f3c18df76260de794",
-                "sha256:6831e1ac20ac52634da606b658b0b2712d26984999c9d93f0c6e59fe62ca741b",
-                "sha256:77f0d9fa5e10d03aa4528436e33423bfa3718b86c646615f04616294c935f840",
-                "sha256:828ad813c7cdc2e71dcf141912c685bfe4b548c0e6d9540db6418b807c345ddd",
-                "sha256:85a06c61598b14b015d4df233d249cd5abfa61084ef5b9f64a48e997fd829a82",
-                "sha256:8cb4febad0f0b26c6f62e1628f2053954ad2c555d67660f28dfb1b0496711952",
-                "sha256:a5c58664b23b248b16b96253880b2868fb34358911400a7ba39d7f6399935389",
-                "sha256:aaa0f296e503cda4bc07566f592cd7a28779d433f3a23c48082af425d6d5a78f",
-                "sha256:ab235d9fe64833f12d1334d29b558aacedfbca2356dfb9691f2d0d38a8a7bfb4",
-                "sha256:b3b0c8f660fae65eac74fbf003f3103769b90012ae7a460863010539bb7a80da",
-                "sha256:bab8e6d510d2ea0f1d14f12642e3f35cefa47a9b2e4c7cea1852b52bc9c49647",
-                "sha256:c45297bbdbc8bb79b02cf41417d63352b70bcb76f1bbb1ee7d47b3e89e42f95d",
-                "sha256:d19bca47c8a01b92640c614a9147b081a1974f69168ecd494687c827109e8f42",
-                "sha256:d64b4340a0c488a9e79b66ec9f9d77d02b99b772c8b8afd46c1294c1d39ca478",
-                "sha256:da969da069a82bbb5300b59161d8d7c8d423bc4ccd3b410a9b4d8932aeefc14b",
-                "sha256:ed02c7539705696ecb7dc9d476d861f3904a8d2b7e894bd418994920935d36bb",
-                "sha256:ee5b8abc35b549012e03a7b1e86c09491457dba6c94112a2482b18589cc2bdb9"
-            ],
-            "version": "==4.5.2"
+                "sha256:004d1880bed2d97151facef49f08e255a20ceb6f9432df75f4eef018fdd5a78c",
+                "sha256:01d84219b5cdbfc8122223b39a954820929497a1cb1422824bb86b07b74594b6",
+                "sha256:040af6c32813fa3eae5305d53f18875bedd079960822ef8ec067a66dd8afcd45",
+                "sha256:06191eb60f8d8a5bc046f3799f8a07a2d7aefb9504b0209aff0b47298333302a",
+                "sha256:13034c4409db851670bc9acd836243aeee299949bd5673e11844befcb0149f03",
+                "sha256:13c4ee887eca0f4c5a247b75398d4114c37882658300e153113dafb1d76de529",
+                "sha256:184a47bbe0aa6400ed2d41d8e9ed868b8205046518c52464fde713ea06e3a74a",
+                "sha256:18ba8bbede96a2c3dde7b868de9dcbd55670690af0988713f0603f037848418a",
+                "sha256:1aa846f56c3d49205c952d8318e76ccc2ae23303351d9270ab220004c580cfe2",
+                "sha256:217658ec7187497e3f3ebd901afdca1af062b42cfe3e0dafea4cced3983739f6",
+                "sha256:24d4a7de75446be83244eabbff746d66b9240ae020ced65d060815fac3423759",
+                "sha256:2910f4d36a6a9b4214bb7038d537f015346f413a975d57ca6b43bf23d6563b53",
+                "sha256:2949cad1c5208b8298d5686d5a85b66aae46d73eec2c3e08c817dd3513e5848a",
+                "sha256:2a3859cb82dcbda1cfd3e6f71c27081d18aa251d20a17d87d26d4cd216fb0af4",
+                "sha256:2cafbbb3af0733db200c9b5f798d18953b1a304d3f86a938367de1567f4b5bff",
+                "sha256:2e0d881ad471768bf6e6c2bf905d183543f10098e3b3640fc029509530091502",
+                "sha256:30c77c1dc9f253283e34c27935fded5015f7d1abe83bc7821680ac444eaf7793",
+                "sha256:3487286bc29a5aa4b93a072e9592f22254291ce96a9fbc5251f566b6b7343cdb",
+                "sha256:372da284cfd642d8e08ef606917846fa2ee350f64994bebfbd3afb0040436905",
+                "sha256:41179b8a845742d1eb60449bdb2992196e211341818565abded11cfa90efb821",
+                "sha256:44d654437b8ddd9eee7d1eaee28b7219bec228520ff809af170488fd2fed3e2b",
+                "sha256:4a7697d8cb0f27399b0e393c0b90f0f1e40c82023ea4d45d22bce7032a5d7b81",
+                "sha256:51cb9476a3987c8967ebab3f0fe144819781fca264f57f89760037a2ea191cb0",
+                "sha256:52596d3d0e8bdf3af43db3e9ba8dcdaac724ba7b5ca3f6358529d56f7a166f8b",
+                "sha256:53194af30d5bad77fcba80e23a1441c71abfb3e01192034f8246e0d8f99528f3",
+                "sha256:5fec2d43a2cc6965edc0bb9e83e1e4b557f76f843a77a2496cbe719583ce8184",
+                "sha256:6c90e11318f0d3c436a42409f2749ee1a115cd8b067d7f14c148f1ce5574d701",
+                "sha256:74d881fc777ebb11c63736622b60cb9e4aee5cace591ce274fb69e582a12a61a",
+                "sha256:7501140f755b725495941b43347ba8a2777407fc7f250d4f5a7d2a1050ba8e82",
+                "sha256:796c9c3c79747146ebd278dbe1e5c5c05dd6b10cc3bcb8389dfdf844f3ead638",
+                "sha256:869a64f53488f40fa5b5b9dcb9e9b2962a66a87dab37790f3fcfb5144b996ef5",
+                "sha256:8963a499849a1fc54b35b1c9f162f4108017b2e6db2c46c1bed93a72262ed083",
+                "sha256:8d0a0725ad7c1a0bcd8d1b437e191107d457e2ec1084b9f190630a4fb1af78e6",
+                "sha256:900fbf7759501bc7807fd6638c947d7a831fc9fdf742dc10f02956ff7220fa90",
+                "sha256:92b017ce34b68a7d67bd6d117e6d443a9bf63a2ecf8567bb3d8c6c7bc5014465",
+                "sha256:970284a88b99673ccb2e4e334cfb38a10aab7cd44f7457564d11898a74b62d0a",
+                "sha256:972c85d205b51e30e59525694670de6a8a89691186012535f9d7dbaa230e42c3",
+                "sha256:9a1ef3b66e38ef8618ce5fdc7bea3d9f45f3624e2a66295eea5e57966c85909e",
+                "sha256:af0e781009aaf59e25c5a678122391cb0f345ac0ec272c7961dc5455e1c40066",
+                "sha256:b6d534e4b2ab35c9f93f46229363e17f63c53ad01330df9f2d6bd1187e5eaacf",
+                "sha256:b7895207b4c843c76a25ab8c1e866261bcfe27bfaa20c192de5190121770672b",
+                "sha256:c0891a6a97b09c1f3e073a890514d5012eb256845c451bd48f7968ef939bf4ae",
+                "sha256:c2723d347ab06e7ddad1a58b2a821218239249a9e4365eaff6649d31180c1669",
+                "sha256:d1f8bf7b90ba55699b3a5e44930e93ff0189aa27186e96071fac7dd0d06a1873",
+                "sha256:d1f9ce122f83b2305592c11d64f181b87153fc2c2bbd3bb4a3dde8303cfb1a6b",
+                "sha256:d314ed732c25d29775e84a960c3c60808b682c08d86602ec2c3008e1202e3bb6",
+                "sha256:d636598c8305e1f90b439dbf4f66437de4a5e3c31fdf47ad29542478c8508bbb",
+                "sha256:deee1077aae10d8fa88cb02c845cfba9b62c55e1183f52f6ae6a2df6a2187160",
+                "sha256:ebe78fe9a0e874362175b02371bdfbee64d8edc42a044253ddf4ee7d3c15212c",
+                "sha256:f030f8873312a16414c0d8e1a1ddff2d3235655a2174e3648b4fa66b3f2f1079",
+                "sha256:f0b278ce10936db1a37e6954e15a3730bea96a0997c26d7fee88e6c396c2086d",
+                "sha256:f11642dddbb0253cc8853254301b51390ba0081750a8ac03f20ea8103f0c56b6"
+            ],
+            "version": "==5.5"
         },
         "idna": {
             "hashes": [
@@ -98,27 +119,35 @@
             ],
             "version": "==2.7"
         },
+        "importlib-metadata": {
+            "hashes": [
+                "sha256:19192b88d959336bfa6bdaaaef99aeafec179eca19c47c804e555703ee5f07ef",
+                "sha256:2e881981c9748d7282b374b68e759c87745c25427b67ecf0cc67fb6637a1bff9"
+            ],
+            "markers": "python_version < '3.8'",
+            "version": "==4.0.0"
+        },
         "more-itertools": {
             "hashes": [
-                "sha256:c187a73da93e7a8acc0001572aebc7e3c69daf7bf6881a2cea10650bd4420092",
-                "sha256:c476b5d3a34e12d40130bc2f935028b5f636df8f372dc2c1c01dc19681b2039e",
-                "sha256:fcbfeaea0be121980e15bc97b3817b5202ca73d0eae185b4550cbfce2a3ebb3d"
+                "sha256:5652a9ac72209ed7df8d9c15daf4e1aa0e3d2ccd3c87f8265a0673cd9cbc9ced",
+                "sha256:c5d6da9ca3ff65220c3bfd2a8db06d698f05d4d2b9be57e1deb2be5a45019713"
             ],
-            "version": "==4.3.0"
+            "version": "==8.7.0"
         },
         "pluggy": {
             "hashes": [
-                "sha256:447ba94990e8014ee25ec853339faf7b0fc8050cdc3289d4d71f7f410fb90095",
-                "sha256:bde19360a8ec4dfd8a20dcb811780a30998101f078fc7ded6162f0076f50508f"
+                "sha256:15b2acde666561e1298d71b523007ed7364de07029219b604cf808bfa1c765b0",
+                "sha256:966c145cd83c96502c3c3868f50408687b38434af77734af1e9ca461a4081d2d"
             ],
-            "version": "==0.8.0"
+            "version": "==0.13.1"
         },
         "py": {
             "hashes": [
-                "sha256:bf92637198836372b520efcba9e020c330123be8ce527e535d185ed4b6f45694",
-                "sha256:e76826342cefe3c3d5f7e8ee4316b80d1dd8a300781612ddbc765c17ba25a6c6"
+                "sha256:21b81bda15b66ef5e1a777a21c4dcd9c20ad3efd0b3f817e7a809035269e1bd3",
+                "sha256:3b80836aa6d1feeaa108e046da6423ab8f6ceda6468545ae8d02d9d58d18818a"
             ],
-            "version": "==1.7.0"
+            "index": "pypi",
+            "version": "==1.10.0"
         },
         "pytest": {
             "hashes": [
@@ -154,17 +183,33 @@
         },
         "six": {
             "hashes": [
-                "sha256:70e8a77beed4562e7f14fe23a786b54f6296e34344c23bc42f07b15018ff98e9",
-                "sha256:832dc0e10feb1aa2c68dcc57dbb658f1c7e65b9b61af69048abc87a2db00a0eb"
+                "sha256:30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259",
+                "sha256:8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced"
+            ],
+            "version": "==1.15.0"
+        },
+        "typing-extensions": {
+            "hashes": [
+                "sha256:7cb407020f00f7bfc3cb3e7881628838e69d8f3fcab2f64742a5e76b2f841918",
+                "sha256:99d4073b617d30288f569d3f13d2bd7548c3a7e4c8de87db09a9d29bb3a4a60c",
+                "sha256:dafc7639cde7f1b6e1acc0f457842a83e722ccca8eef5270af2d74792619a89f"
             ],
-            "version": "==1.11.0"
+            "markers": "python_version < '3.8'",
+            "version": "==3.7.4.3"
         },
         "urllib3": {
             "hashes": [
-                "sha256:61bf29cada3fc2fbefad4fdf059ea4bd1b4a86d2b6d15e1c7c0b582b9752fe39",
-                "sha256:de9529817c93f27c8ccbfead6985011db27bd0ddfcdb2d86f3f663385c6a9c22"
+                "sha256:2393a695cd12afedd0dcb26fe5d50d0cf248e5a66f75dbd89a3d4eb333a61af4",
+                "sha256:a637e5fae88995b256e3409dc4d52c2e2e0ba32c42a6365fee8bbd2238de3cfb"
+            ],
+            "version": "==1.24.3"
+        },
+        "zipp": {
+            "hashes": [
+                "sha256:3607921face881ba3e026887d8150cca609d517579abe052ac81fc5aeffdbd76",
+                "sha256:51cb66cc54621609dd593d1787f286ee42a5c0adbb4b29abea5a63edc3e03098"
             ],
-            "version": "==1.24.1"
+            "version": "==3.4.1"
         }
     },
     "develop": {}