Update docs on webpack version upgrade [ci skip]

Author: flexdinesh

README.md

@@ -48,7 +48,7 @@ This boilerplate features all the latest tools and practices in the industry.
 - _React.js_ - React 16, React Router 5
 - _Redux.js_ - Redux saga, Redux immutable and Reselect
 - _Babel_ - ES6, ESNext, Airbnb and React/Recommended config
-- _Webpack_ - Webpack 3, Hot Reloading, Code Splitting, Optimized Prod Build and more
+- _Webpack_ - Webpack 4, Hot Reloading, Code Splitting, Optimized Prod Build and more
 - _Test_ - Jest with Enzyme
 - _Lint_ - ESlint
 - _Styles_ - SCSS Styling