Updated docstring

connection.py

@@ -27,7 +27,7 @@ class Connection(object):
     >>>         print 'Received message "%s"' % message.payload
     >>>         self.send(wspy.TextMessage(message.payload))
 
-    >>>     def onclose(self, message):
+    >>>     def onclose(self, code, reason):
     >>>         print 'Connection closed'
 
     >>> server = wspy.websocket()