send a group of photos or videos as an album. On success, an array of the sent Messages is returned.
        :param chat_id:
        :param media:
        :param disable_notification:
        :param reply_to_message_id:
        :return:

def send_media_group(self, chat_id, media, disable_notification=None, reply_to_message_id=None):
        """
        send a group of photos or videos as an album. On success, an array of the sent Messages is returned.
        :param chat_id:
        :param media:
        :param disable_notification:
        :param reply_to_message_id:
        :return:
        """
        result = apihelper.send_media_group(self.token, chat_id, media, disable_notification, reply_to_message_id)
        ret = []
        for msg in result:
            ret.append(types.Message.de_json(msg))
        return ret