Remove old unmonitored Freenode link.

Author: jashkenas

index.html

@@ -427,8 +427,8 @@
       The project is
       <a href="https://github.com/jashkenas/underscore">hosted on GitHub</a>.
       You can report bugs and discuss features on the
-      <a href="https://github.com/jashkenas/underscore/issues">issues page</a>,
-      on Freenode in the <tt>#documentcloud</tt> channel, or in our <a href="https://gitter.im/jashkenas/underscore">Gitter</a>
+      <a href="https://github.com/jashkenas/underscore/issues">issues page</a>
+      or chat in the <a href="https://gitter.im/jashkenas/underscore">Gitter</a>
       channel.
     </p>