add disconnect

main.py

@@ -1,4 +1,4 @@
-from fastapi import FastAPI,Cookie, Depends, FastAPI, Query, WebSocket, status
+from fastapi import FastAPI,Cookie, Depends, FastAPI, Query, WebSocket, status, WebSocketDisconnect
 import openshot
 from os import listdir
 from os.path import isfile, isdir, join