fix an HTML error

index.html

@@ -25,7 +25,7 @@
 </table>
 
 <p>
-You can also contact us on the irc channel <a href="irc://chat.freenode.net/#youtube-dl">#youtube-dl</a>(<a href="http://webchat.freenode.net/?randomnick=1&channels=youtube-dl">webchat</a>) on freenode.
+You can also contact us on the irc channel <a href="irc://chat.freenode.net/#youtube-dl">#youtube-dl</a>(<a href="http://webchat.freenode.net/?randomnick=1&amp;channels=youtube-dl">webchat</a>) on freenode.
 </p>
 
 <div class="note">