取消关注xml：
```
<xml><ToUserName><![CDATA[gh_6e9d88028689]]></ToUserName>
<FromUserName><![CDATA[oaMwh1cRw11jAkGHfozqZDxcSuLg]]></FromUserName>
<CreateTime>1565850005</CreateTime>
<MsgType><![CDATA[event]]></MsgType>
<Event><![CDATA[unsubscribe]]></Event>
<EventKey><![CDATA[]]></EventKey>
</xml>
```
关注xml：
```
<xml><ToUserName><![CDATA[gh_6e9d88028689]]></ToUserName>
<FromUserName><![CDATA[oaMwh1cRw11jAkGHfozqZDxcSuLg]]></FromUserName>
<CreateTime>1565850013</CreateTime>
<MsgType><![CDATA[event]]></MsgType>
<Event><![CDATA[subscribe]]></Event>
<EventKey><![CDATA[]]></EventKey>
</xml>
```
按钮事件xml：
```
<xml><ToUserName><![CDATA[gh_6e9d88028689]]></ToUserName>
<FromUserName><![CDATA[oaMwh1bYGSmpLrmfyYeIrdynAEUY]]></FromUserName>
<CreateTime>1565852827</CreateTime>
<MsgType><![CDATA[event]]></MsgType>
<Event><![CDATA[CLICK]]></Event>
<EventKey><![CDATA[海报生成]]></EventKey>
</xml>
```
