【fix sonar】 AnnouncementSendModel.java文件

jero-boot/jero-boot-module-system/src/main/java/com/jero/modules/system/model/AnnouncementSendModel.java

@@ -1,15 +1,12 @@
 package com.jero.modules.system.model;
 
-import java.io.Serializable;
-
-import org.springframework.format.annotation.DateTimeFormat;
-
 import com.baomidou.mybatisplus.annotation.IdType;
 import com.baomidou.mybatisplus.annotation.TableId;
-import com.baomidou.mybatisplus.annotation.TableName;
 import com.fasterxml.jackson.annotation.JsonFormat;
-
 import lombok.Data;
+import org.springframework.format.annotation.DateTimeFormat;
+
+import java.io.Serializable;
 
 /**
  * @Description: 用户通告阅读标记表