update readme

README.md

@@ -2,9 +2,9 @@
 
 [![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>  
 
-A Native Picker with high performance
+A Native Picker with high performance.
 
-pure javascript version -> [v3.0.5][https://github.com/beefe/react-native-picker/tree/pure-javascript-version]
+pure javascript version -> [v3.0.5](https://github.com/beefe/react-native-picker/tree/pure-javascript-version)
 
 
 ![ui](./doc/ui.gif)