title: The telegram bot should delete Sticker, Gif, and Voice that are sent to the group;but do not delete them
body: <p>I built a telegram bot with a python-telegram-bot module.I added the bot to the group and got the bot in the admin group.The bot should be delete when Sticker, Gif or Voice are sent to the group;But the bot does not delete them.bot code:</p>
  
  <pre><code>from telegram.ext import Updater, MessageHandler, Filters
  
  def sticker_method(bot, update):
      bot.delete_sticker(chat_id = update.message.chat_id, sticker_id = update.sticker.chat_id)
      bot.delete_gif(chat_id = update.message.chat_id, gif_id = update.gif.chat_id)
      bot.delete_voice(chat_id = update.message.chat_id, voice_id = update.voice.chat_id)
  
  
  def main():
      updater = Updater(token='TOKEN')
      dispatcher = updater.dispatcher
      dispatcher.add_handler(MessageHandler(Filters.all, sticker_method))
  
      updater.start_polling()
      updater.idle()
  
  
  if __name__ == '__main__':
      main()
  # for exit
  # updater.idle()
  </code></pre>
  
  <p>There is no error during execution;But the bot does nothing!</p>