Update travis config

Author: tedium-bot

.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: NQunbnhwQFU/uRU1Dz8VIYXpG9cq4wEldllph4To1XJqEa21pG1Q9+a/M4+aOkW6iIPRgfI/bQ6mPWaRnE/KGrsusARqgYDytq42dJpSoLOiLYbVdRKIHI3t9cr1MiZKUxwz/vpOsKcMK8dW5RmR6zJ8k5roijNAmjFRlzfGOKY=
-  - secure: Ge6m7GkHZdhv6Ru7uNEVS9jUQ15CsCa9ZBcBQncA/w8zEmDfM2tzcTUJ54piZ03mo9qnWOcV4IcJj78nXsyKcYZHiGpe63w5R5NWhO3uZ72C48SMPbWQxL0Kyt6PN4u7i5MNCMJ3+a+ttyet8H9qTzxAwOLVSFCUr3On1/B1APU=
-node_js: stable
+    - secure: >-
+        NQunbnhwQFU/uRU1Dz8VIYXpG9cq4wEldllph4To1XJqEa21pG1Q9+a/M4+aOkW6iIPRgfI/bQ6mPWaRnE/KGrsusARqgYDytq42dJpSoLOiLYbVdRKIHI3t9cr1MiZKUxwz/vpOsKcMK8dW5RmR6zJ8k5roijNAmjFRlzfGOKY=
+    - secure: >-
+        Ge6m7GkHZdhv6Ru7uNEVS9jUQ15CsCa9ZBcBQncA/w8zEmDfM2tzcTUJ54piZ03mo9qnWOcV4IcJj78nXsyKcYZHiGpe63w5R5NWhO3uZ72C48SMPbWQxL0Kyt6PN4u7i5MNCMJ3+a+ttyet8H9qTzxAwOLVSFCUr3On1/B1APU=
+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