Fix import

Author: Pithikos

websocket_server/websocket_server.py

@@ -9,10 +9,11 @@
 import logging
 from socket import error as SocketError
 import errno
-from websocket_server.thread import WebsocketServerThread
-
+import threading
 from socketserver import ThreadingMixIn, TCPServer, StreamRequestHandler
 
+from websocket_server.thread import WebsocketServerThread
+
 logger = logging.getLogger(__name__)
 logging.basicConfig()