Update README.md

Author: tomcartwrightuk

README.md

@@ -13,7 +13,7 @@ var P2P = require('socket.io-p2p');
 var io = require('socket.io-client');
 var socket = io();
 
-var p2p = new P2P(socket, {});
+var p2p = new P2P(socket);
 
 p2p.on('ready', function(){
   p2p.usePeerConnection = true;