Update README.md

Author: maxmoo

README.md

@@ -3,7 +3,7 @@
 <!--![](https://github.com/maxmoo/CCActionSheet/p_sheet.gif)-->
 
 <img src="https://github.com/maxmoo/CCActionSheet/blob/master/p_sheet2.gif" alt="" style="max-width:100%;">
-
+<img src="https://github.com/maxmoo/CCActionSheet/blob/master/Demo/center.gif" alt="" style="max-width:100%;">
 
 
 //模仿微信自定义actionSheet