Use @thomascube's roundcube add-on fork.

index.html

@@ -83,8 +83,7 @@
             into Django. It adds single-signon-support (SSO) support and a database model to store XMPP credentials.
         </li>
         <li><h4><a href="http://roundcube.net" target="_blank">Roundcube</a></h4>
-            <strong><a href="https://github.com/priyadi/roundcube-converse.js-xmpp-plugin" target="_blank">roundcube-converse.js-xmpp-plugin</a></strong>
-            is a plugin for Roundcube Webmail. It's README states that it's still a work in progress.
+            <strong><a href="https://github.com/thomascube/roundcube-converse.js-xmpp-plugin" target="_blank">roundcube-converse.js-xmpp-plugin</a></strong> is a plugin for Roundcube Webmail.
         </li>
     </ul>