text: Title: Websockets RuntimeError "This event loop is already running"
  Body: When I'm trying to run a websocket, then in some time stop it, and run a new websocket, the following error occurs:
  
  Exception in thread Thread-2:
  Traceback (most recent call last):
  
    File "D:\python\Python39\lib\threading.py", line 950, in _bootstrap_inner
      self.run()
    File "D:\python\Python39\lib\site-packages\binance\threaded_stream.py", line 59, in run
      self._loop.run_until_complete(self.socket_listener())
    File "D:\python\Python39\lib\asyncio\base_events.py", line 618, in run_until_complete
      self._check_running()
    File "D:\python\Python39\lib\asyncio\base_events.py", line 578, in _check_running
      raise RuntimeError('This event loop is already running')
  RuntimeError: This event loop is already running
  D:\python\Python39\lib\threading.py:952: RuntimeWarning: coroutine 'ThreadedApiManager.socket_listener' was never awaited
    self._invoke_excepthook(self)
  RuntimeWarning: Enable tracemalloc to get the object allocation traceback
  
  This is a part of code which I use to run websocket:
  `twm = ThreadedWebsocketManager(self.main_window.api_key, self.main_window.api_secret)`
  `twm.start()`
  
  `current_candle_websocket = twm.start_kline_futures_socket(callback=self.handle_candle_message, symbol=self.symbol, interval=Client.KLINE_INTERVAL_5MINUTE)`
  
  This is a part of code which I use to stop websocket:
  `twm.stop_socket(current_candle_websocket)`
  `twm.stop()`
  `twm = ''`
  
  I use Python 3.9. The error didn't occur on python-binance 1.0.15, but since some API features are retired I can no longer use this version and updated python-binance to 1.0.19, and after that I am getting this error.