Update README.md

Author: 2534290808

README.md

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 # react-native-MJRefresh[![npm version](https://badge.fury.io/js/react-native-mjrefresh.svg)](https://badge.fury.io/js/react-native-mjrefresh)
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+如果你喜欢，请不好吝啬你的:smile: star :smile:
 android自动刷新组件见[react-native-SmartRefreshLayout](https://github.com/react-native-studio/react-native-SmartRefreshLayout)
 ## 第一步
 工程目录下运行<br> `npm install --save react-native-mjrefresh`<br> 或者<br> `yarn add react-native-mjrefresh`(已经安装了yarn)