Update README.md

Author: andresn

README.md

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 # ReduxSimpleStarterRefreshed
 
 This fork contains the following updates as of 3/27/2018:
+- Upgraded to React 16.
+- Upgraded to React-Redux 5.
 - Upgraded to Webpack 4.
+- Changed babel preset to 'env': https://www.npmjs.com/package/babel-preset-env 
 - Moved from using Mocha/Chai to Jest/Enzyme.
 - Package control using Yarn instead of NPM.