title: Create file watcher that will restart websocket server when specific files modified
body: <p>Having file <code>websocket_server.py</code> and <code>webscoket_service.py</code> to run websocket I do <code>python websocket_server.py</code>
  How show I configure custom file watcher so when I modify <code>webscoket_service.py</code>, my websocket server being restarted</p>