#297 WxMpMenu类增加实现序列化接口

weixin-java-mp/src/main/java/me/chanjar/weixin/mp/bean/menu/WxMpMenu.java

@@ -6,6 +6,7 @@ import me.chanjar.weixin.common.bean.menu.WxMenuRule;
 import me.chanjar.weixin.common.util.ToStringUtils;
 import me.chanjar.weixin.common.util.json.WxGsonBuilder;
 
+import java.io.Serializable;
 import java.util.List;
 
 /**
@@ -15,7 +16,10 @@ import java.util.List;
  * @author <a href="https://github.com/binarywang">binarywang(Binary Wang)</a>
  * </pre>
  */
-public class WxMpMenu {
+public class WxMpMenu implements Serializable{
+
+  private static final long serialVersionUID = -5794350513426702252L;
+
   @SerializedName("menu")
   private WxMpConditionalMenu menu;