:art: 企微客户群回调事件添加MemChangeList字段

weixin-java-cp/src/main/java/me/chanjar/weixin/cp/bean/message/WxCpXmlMessage.java

@@ -155,6 +155,10 @@ public class WxCpXmlMessage implements Serializable {
   @XStreamConverter(value = XStreamCDataConverter.class)
   private String memChangeCnt;
 
+  @XStreamAlias("MemChangeList")
+  @XStreamConverter(value = XStreamCDataConverter.class)
+  private String MemChangeList;
+
   @XStreamAlias("Source")
   @XStreamConverter(value = XStreamCDataConverter.class)
   private String source;