Add an experimental shutdown handler

main.py

@@ -160,8 +160,8 @@ exit_status = 0
 loop = asyncio.new_event_loop()
 asyncio.set_event_loop(loop)
 client = Twitch(settings)
-signal.signal(signal.SIGINT, lambda *_: client.signal_close())
-signal.signal(signal.SIGTERM, lambda *_: client.signal_close())
+signal.signal(signal.SIGINT, lambda *_: client.gui.close())
+signal.signal(signal.SIGTERM, lambda *_: client.gui.close())
 try:
     loop.run_until_complete(client.run())
 except CaptchaRequired: