docs: def send_sticker(self, chat_id=None, sticker=None, reply_to_message_id=None, reply_markup=None):
          """
              Use this method to send .webp stickers. On success, the sent Message is returned.
          """
          payload = dict(chat_id=chat_id,
                         reply_to_message_id=reply_to_message_id,
                         reply_markup=reply_markup)
          files = dict(sticker=open(sticker, 'rb'))
          return Message.from_api(api, **self._post('sendSticker', payload, files))