Merge pull request socketio#683 from jherdman/documentation-fix

Minor documentation fix

Readme.md

@@ -131,7 +131,7 @@ The following example defines a socket that listens on '/chat' and one for
 var io = require('socket.io').listen(80);
 
 var chat = io
-  .of('/chat');
+  .of('/chat')
   .on('connection', function (socket) {
     socket.emit('a message', { that: 'only', '/chat': 'will get' });
     chat.emit('a message', { everyone: 'in', '/chat': 'will get' });