disconnect 시그니쳐 수정

core/connection.go

@@ -95,7 +95,7 @@ func (cs *connections) ClientConnected(conn *websocket.Conn, callby *wshandler.S
 	cs.new(callby.Accid, conn)
 }
 
-func (cs *connections) ClientDisconnected(conn *websocket.Conn, callby *wshandler.Sender) {
+func (cs *connections) ClientDisconnected(msg string, callby *wshandler.Sender) {
 	cs.delete(callby.Accid)
 }