Added an updates thread and construtor_id to TLObjects

A new thread is now created when MtProtoSender is created.
This thread constantly listens for Telegram updates (such as
incoming messages), so the updates can be received any time
rather than only when sending another request.

main.py

@@ -78,4 +78,5 @@ if __name__ == '__main__':
             else:
                 client.send_message(input_peer, msg, markdown=True, no_web_page=True)
 
-    print('Thanks for trying the interactive example! Exiting.')
+    print('Thanks for trying the interactive example! Exiting...')
+    client.disconnect()