update readme

README.md

@@ -2,8 +2,8 @@
 
 [![npm version](https://img.shields.io/npm/v/react-native-picker.svg?style=flat-square)](https://www.npmjs.com/package/react-native-picker) <a href="https://david-dm.org/beefe/react-native-picker"><img src="https://david-dm.org/beefe/react-native-picker.svg?style=flat-square" alt="dependency status"></a>   
 
-![ui2](./doc/ui2.jpg)
-![ui1](./doc/ui1.jpg)
+![ui3](./doc/ui3.jpg)
+![ui4](./doc/ui4.jpg)
 
 ###Documentation