Update README.md

Author: runjuu

README.md

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 # html-inline-css-webpack-plugin
 [![MIT Licence](https://badges.frapsoft.com/os/mit/mit.svg?v=103)](https://opensource.org/licenses/mit-license.php)
 [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](https://github.com/Runjuu/html-inline-css-webpack-plugin/pulls)
+[![Total downloads](https://img.shields.io/npm/dm/html-inline-css-webpack-plugin.svg)](https://www.npmjs.com/package/html-inline-css-webpack-plugin)
 [![npm version](https://badge.fury.io/js/html-inline-css-webpack-plugin.svg)](https://badge.fury.io/js/html-inline-css-webpack-plugin)
 
 Convert external stylesheet to embedded stylesheet, aka document stylesheet.