pooling update handlers, add overlay bot module

bots/models.py

@@ -23,10 +23,11 @@ class TelegramBot(models.Model):
     def get_bot(self):
         return Bot(self.bot_token)
 
-    def build_dispatcher(self):
+    def build_dispatcher(self, error_handler):
         bot = self.get_bot()
         bot.get_me()
         dispatcher = Dispatcher(bot, None, workers=0, use_context=True)
+        dispatcher.add_error_handler(error_handler)
         self.config.build_dispatcher(dispatcher)
         return dispatcher