更新群主题

• 请求参数示例：

  {
    "baseRequest" : {
        "uid": "23622391649384525",
        "deviceID": "e650854909077878",
        "deviceType": "iOS",
        "token": "23622391649384525_3664770b-a97e-4fbe-8433-08ae20267114"
    },
    "ChatRoomName": "0787f7b1-7eb4-480a-b726-5f3093a8e0d8@qun",
    "topic": "测试名称"
  }
  

  其中topic为群主题

• 响应示例：

  {
    "baseResponse": {
        "ret": 0,
        "errMsg": "update Qun Topic success"
    }
  }