chore(contributing): update the javascript style guide url

update the javascript style guide url from googlecode to github

Fix angular#3153
Close angular#3171

Author: CarreraPHP

CONTRIBUTING.md

@@ -222,7 +222,7 @@ changes to be accepted, the CLA must be signed. It's a quick process, we promise
 [github]: https://github.com/angular/angular-cli
 [gitter]: https://gitter.im/angular/angular-cli
 [individual-cla]: http://code.google.com/legal/individual-cla-v1.0.html
-[js-style-guide]: http://google-styleguide.googlecode.com/svn/trunk/javascriptguide.xml
+[js-style-guide]: https://google.github.io/styleguide/jsguide.html
 [jsfiddle]: http://jsfiddle.net/
 [plunker]: http://plnkr.co/edit
 [runnable]: http://runnable.com/