code: def send_group_text(self, sender, receiver, content):
          
          return self.send_text(sender, 'group', receiver, content)
docs: 发送群聊文本消息
  
          :param sender: 发送人
          :param receiver: 会话 ID
          :param content: 消息内容
          :return: 返回的 JSON 数据包