Update docs url

Author: mattrobenolt

README.md

@@ -7,7 +7,7 @@ Raven.js is a tiny standalone JavaScript client for [Sentry](https://www.getsent
 ## Resources
 
  * [Download](http://ravenjs.com)
- * [Documentation](https://raven-js.readthedocs.org)
+ * [Documentation](https://docs.getsentry.com/hosted/clients/javascript/)
  * [Bug Tracker](https://github.com/getsentry/raven-js/issues)
  * [IRC](irc://chat.freenode.net/sentry) (chat.freenode.net, #sentry)
  * Follow [@mattrobenolt](https://twitter.com/mattrobenolt) on Twitter for updates