公告更新修改

@@ -93,7 +93,7 @@ type UpdateBulletinRequest struct {
 	AllowClose int    `json:"allow_close"`
 	//AllowCondition int      `json:"allow_condition"`
 	QuestionSwitch int             `json:"question_switch"`
-	Receiver       []string `json:"receiver" valid:"Required"`
+	Receiver       []VisibleObject `json:"receiver" valid:"Required"`
 	Question       Question        `json:"question"`
 	Cover          Cover           `json:"cover" valid:"Required"`
 }