docs: update ruby bindings maintainer to chris lalancette

docs/bindings.html.in

@@ -60,7 +60,7 @@
         </p>
       </li>
       <li>
-        <strong>Ruby</strong>: David Lutterkort develops
+        <strong>Ruby</strong>: Chris Lalancette develops
         <a href="http://libvirt.org/ruby/">Ruby bindings</a>.
       </li>
     </ul>