react-app-rewire-define-plugin

Add webpack.DefinePlugin to a react-app-rewired config.

``js
const rewireDefinePlugin = require('react-app-rewire-define-plugin')

// Use webpack.DefinePlugin to add the version number from package.json
config = rewireDefinePlugin(config, env, {
'process.env.VERSION': JSON.stringify(require('package.json').version)
})
``