修改app演示地址

README.md

@@ -32,7 +32,7 @@
 
 > 前台商城系统
 
-前端项目`mall-app-web`演示地址：[www.macro.com/mall-app/mainpage.html](http://macro-oss.oss-cn-shenzhen.aliyuncs.com/mall-app/mainpage.html)
+前端项目`mall-app-web`演示地址：[http://39.98.69.210/mall-app/mainpage.html](http://39.98.69.210/mall-app/mainpage.html)
 
 ![前台商城系统功能演示.gif](https://github.com/macrozheng/mall/blob/master/document/resource/mall-app.gif)