Update README.md

Author: While1true

README.md

@@ -4,6 +4,7 @@ A new Flutter application.
 
 ## 基于 refreshIndicate改造
 ![gif](https://github.com/While1true/flutter_refresh/blob/master/2018-06-02-15-14-48.gif)
+gif看起来很快
 ![2018-06-04-17-42-35.gif](https://upload-images.jianshu.io/upload_images/6456519-8e40c45f174d2a6b.gif?imageMogr2/auto-orient/strip)
 ## 使用：注意事项和官方一样，比如onrefresh要返回future； child：必须为scrollable
 ```