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: dUMG4gWauTfBoni97er7PvM3qQ4bcAf7J2PvSIe/F8b1NX4rwf6dlAkUUoDAru8C7UTSpveWGgZgTFsIzn+UNKsnjWMR20oqxYD56cUInNsDdd3rC7jj7Asyfi3ULxkgcNRMm0MAelEnp6Q57GS1OpGRt6sMJoEVI62YodgQE9s=
-  - secure: ae6sSw/OJyyGVzljBsok9KLi0BV+r4IvbvjVPGYaG2TtqR+JonyEu9OI2V/DgAJJ3RHQo0W/go4NcZlQmMb17gNCuqxWVeG/Tf2DH/QJr7RR9bUhYwOJTRR4dzXvaEgLiLOZG5grOGaM2pVQETnTIrLQtic2O18uhM8Ro2oV//s=
-node_js: stable
+    - secure: >-
+        dUMG4gWauTfBoni97er7PvM3qQ4bcAf7J2PvSIe/F8b1NX4rwf6dlAkUUoDAru8C7UTSpveWGgZgTFsIzn+UNKsnjWMR20oqxYD56cUInNsDdd3rC7jj7Asyfi3ULxkgcNRMm0MAelEnp6Q57GS1OpGRt6sMJoEVI62YodgQE9s=
+    - secure: >-
+        ae6sSw/OJyyGVzljBsok9KLi0BV+r4IvbvjVPGYaG2TtqR+JonyEu9OI2V/DgAJJ3RHQo0W/go4NcZlQmMb17gNCuqxWVeG/Tf2DH/QJr7RR9bUhYwOJTRR4dzXvaEgLiLOZG5grOGaM2pVQETnTIrLQtic2O18uhM8Ro2oV//s=
+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