Update index.html with up-to-date Roundcube plugin too (#713)

* Use roundcube plugin fork with current converse.js

The previous plugin developer is still running an ancient version of converse.js.  This updates the link to point to a fork that us running a current version of converse.js.

* Add up-to-date version of roundcube plugin to index.html too

index.html

@@ -116,7 +116,7 @@
                             <li><a href="http://github.com/collective/collective.xmpp.chat" target="_blank">Plone</a></li>
                             <li><a href="https://pypi.python.org/pypi/django-conversejs" target="_blank">Django (option 1)</a></li>
                             <li><a href="https://github.com/fpytloun/django-xmpp" target="_blank">Django (option 2)</a></li>
-                            <li><a href="https://github.com/priyadi/roundcube-converse.js-xmpp-plugin" target="_blank">Roundcube</a></li>
+                            <li><a href="https://github.com/devurandom/roundcube-converse.js-xmpp-plugin" target="_blank">Roundcube</a></li>
                             <li><a href="http://wordpress.org/plugins/conversejs" target="_blank">Wordpress</a></li>
                             <li><a href="https://github.com/jcbrand/patterns.converse" target="_blank">Patternslib</a></li>
                             <li><a href="https://github.com/keensoft/alfresco-js-chat-share" target="_blank">Alfresco</a></li>