code: func (user *User) UpdateRemark(openID, remark string) (err error) {
  	var accessToken string
  	accessToken, err = user.GetAccessToken()
  	if err != nil {
  		return
  	}
  
  	uri := fmt.Sprintf(updateRemarkURL, accessToken)
  	var response []byte
  	response, err = util.PostJSON(uri, map[string]string{"openid": openID, "remark": remark})
  	if err != nil {
  		return
  	}
  
  	return util.DecodeWithCommonError(response, "UpdateRemark")
  }
docs: // UpdateRemark 设置用户备注名