Update app.py

app.py

@@ -9,6 +9,7 @@ import signal
 import websockets
 
 from connect4 import PLAYER1, PLAYER2, Connect4
+from user import User
 
 
 JOIN = {}
@@ -91,7 +92,7 @@ async def start(websocket):
     """
     # Initialize a Connect Four game, the set of WebSocket connections
     # receiving moves from this game, and secret access tokens.
-    game = Connect4()
+    game = User()
     connected = {websocket}
 
     join_key = secrets.token_urlsafe(12)