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: SFfLw5U6C/7UFRyt/ho5AXNnf8E1d7bY6V9lPT2UnHjkNl4NldWyJEkBeaFTERChKmrYBNk33g748OGohL8snCRXCPxM9A/OKRWEGSFIvPmgLs8mkpbNodUAcpL6dbDLlZgcVDHXCn1uvVQgOgzg64FWW5ozphxD4u/nl5nA7aY=
-  - secure: a6YFcuIvE3PJ9C0F7cimJ/R8EGlKy2rlg7Re2ezpL85f4++cYnYBUrNnbwj+BNp5F9IXZxvD6T+kNr+1BJtqILFf54W5baBgB5PVCSt7dry+lrcRUf5yTIRl0yJ+73UJrEWR2UOXaXlGzbQ56k2TWAbnzVbq2jik1vdgSnxbjLE=
-node_js: stable
+    - secure: >-
+        SFfLw5U6C/7UFRyt/ho5AXNnf8E1d7bY6V9lPT2UnHjkNl4NldWyJEkBeaFTERChKmrYBNk33g748OGohL8snCRXCPxM9A/OKRWEGSFIvPmgLs8mkpbNodUAcpL6dbDLlZgcVDHXCn1uvVQgOgzg64FWW5ozphxD4u/nl5nA7aY=
+    - secure: >-
+        a6YFcuIvE3PJ9C0F7cimJ/R8EGlKy2rlg7Re2ezpL85f4++cYnYBUrNnbwj+BNp5F9IXZxvD6T+kNr+1BJtqILFf54W5baBgB5PVCSt7dry+lrcRUf5yTIRl0yJ+73UJrEWR2UOXaXlGzbQ56k2TWAbnzVbq2jik1vdgSnxbjLE=
+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