Update travis config

.travis.yml

@@ -1,23 +1,24 @@
 language: node_js
 sudo: required
 before_script:
-- npm install -g bower polylint web-component-tester
-- bower install
-- polylint
+  - npm install -g bower polylint web-component-tester
+  - bower install
+  - polylint
 env:
   global:
-  - secure: mjikUCoN+UpTbFHwbGXUoKp4vtZ2qNN1JYW79WcOik7fCFmvdFzfYQPDa6y9aJvU3kgkDndGdR/ynLG4kejZjmqTS5fYtdHEwpPVPapbVYnquJvCJKbMN4S2QpGCoq51pjKQ8U3Ys6G5HkmdcDfw3SKk1uMgVzKV7fEI+6WnZ/M=
-  - secure: LHDnBtwK7yO2X4GNmIaAl7t85WWc1U189OiPqemD27+jTcKml0by1n9Mu/yrg94jYgeXab9mHgU3uMtIdQstNNwTDu8CgmmIP4H2EWopHrTi3KM7Z7aeofPgMJsVFXwg+WhNlcCfhEsygHZWTxjJXM4fcGOrFPDa4+BTgRa2hEE=
-node_js: stable
+    - secure: >-
+        mjikUCoN+UpTbFHwbGXUoKp4vtZ2qNN1JYW79WcOik7fCFmvdFzfYQPDa6y9aJvU3kgkDndGdR/ynLG4kejZjmqTS5fYtdHEwpPVPapbVYnquJvCJKbMN4S2QpGCoq51pjKQ8U3Ys6G5HkmdcDfw3SKk1uMgVzKV7fEI+6WnZ/M=
+    - secure: >-
+        LHDnBtwK7yO2X4GNmIaAl7t85WWc1U189OiPqemD27+jTcKml0by1n9Mu/yrg94jYgeXab9mHgU3uMtIdQstNNwTDu8CgmmIP4H2EWopHrTi3KM7Z7aeofPgMJsVFXwg+WhNlcCfhEsygHZWTxjJXM4fcGOrFPDa4+BTgRa2hEE=
+node_js: '6'
 addons:
-  firefox: '46.0'
+  firefox: latest
   apt:
     sources:
-    - google-chrome
+      - google-chrome
     packages:
-    - google-chrome-stable
-  sauce_connect: true
+      - google-chrome-stable
 script:
-- xvfb-run wct
-- if [ "${TRAVIS_PULL_REQUEST}" = "false" ]; then wct -s 'default'; fi
+  - xvfb-run wct
+  - 'if [ "${TRAVIS_PULL_REQUEST}" = "false" ]; then wct -s ''default''; fi'
 dist: trusty