Fix link to docs

Author: bkeepers

README.md

@@ -7,9 +7,9 @@ This is what GitHub uses to display comments that were created from
 email replies.  This code is being open sourced in an effort to
 crowdsource the quality of our email representation.
 
-See more at the [Rocco docs][rocco].
+See the [Ruby docs][rubydocs] for more information.
 
-[rocco]: http://help.github.com/code/email_reply_parser/
+[rubydocs]: http://rubydoc.info/gems/email_reply_parser/
 
 ##Usage