latest version of react-native code example

Example 1: react native version

{  "name": "AwesomeProject",  "version": "0.0.1",  "scripts": {    "start": "node node_modules/react-native/local-cli/cli.js start",+   "postversion": "react-native-version"  }}

Example 2: react native version

$ npm install react-native-version --save-dev# or $ yarn add react-native-version --dev