Update README.md

Author: DustinJackson

README.md

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+This plugin is no longer maintained.  Facebook provides a similar plugin:
+
+https://github.com/facebook/create-react-app/blob/edc671eeea6b7d26ac3f1eb2050e50f75cf9ad5d/packages/react-dev-utils/InlineChunkHtmlPlugin.js#L10
+
+
 Inline Source extension for the HTML Webpack Plugin
 ========================================
 [![npm version](https://badge.fury.io/js/html-webpack-inline-source-plugin.svg)](https://badge.fury.io/js/html-webpack-inline-source-plugin) [![Build status](https://travis-ci.org/DustinJackson/html-webpack-inline-source-plugin.svg?branch=master)](https://travis-ci.org/DustinJackson/html-webpack-inline-source-plugin) [![js-semistandard-style](https://img.shields.io/badge/code%20style-semistandard-brightgreen.svg?style=flat-square)](https://github.com/Flet/semistandard)