Mention official converse.js chat room.

index.html

@@ -211,6 +211,7 @@
                             <li>Follow me on <a href="http://twitter.com/jcopkode" target="_blank">Twitter</a>.</li>
                             <li>Chat with me via XMPP: <a href="xmpp:jc@opkode.com" class="xmpp JSnocheck" title="XMPP/Jabber">jc@opkode.com</a>.</li>
                             <li>For technical support, please write to the mailing list: <a href="mailto:conversejs@librelist.com">conversejs@librelist.com</a>.</li>
+                            <li>Or ask in the Converse.js chat room: <a href="xmpp:discuss@conference.conversejs.org" class="xmpp JSnocheck" title="Converse.js chat room">discuss@conference.conversejs.org</a>.</li>
                             <li>Also check out the <a href="http://librelist.com/browser/conversejs" target="_blank">mailing list archives</a>.</li>
                             <li>Please file <a target="_blank" href="https://github.com/jcbrand/converse.js/issues">bugs on Github</a>.</li>
                             <li>I'm available for features and <a href="http://opkode.com/contact" target="_blank">consulting</a>.</li>