Update README.md

Author: 2534290808

README.md

@@ -97,4 +97,4 @@ nativeOnlyProps = {
 自定义详情可见Example:[HuaWeiRefreshControl.js](https://github.com/react-native-studio/react-native-MJRefresh/blob/master/Example/HuaWeiRefreshControl.js)
 
 ## 示例
-<img src="https://github.com/react-native-studio/react-native-mjrefresh/blob/master/screen_shot.png" width = "300"  alt="图片名称" align=center />
+<img src="https://github.com/react-native-studio/react-native-MJRefresh/blob/master/screen_shot.gif" width = "300"  alt="图片名称" align=center />