Update README.md

Author: Scrum

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 # PostCSS For Plugin
-[![Build Status](https://img.shields.io/travis/GitScrum/postcss-at-rules-variables.svg?style=flat-square)](https://travis-ci.org/GitScrum/postcss-at-rules-variables)[![npm version](https://img.shields.io/npm/v/postcss-at-rules-variables.svg?style=flat-square)](https://www.npmjs.com/package/postcss-at-rules-variables)[![David](https://img.shields.io/david/GitScrum/postcss-at-rules-variables.svg?style=flat-square)](https://github.com/GitScrum/postcss-at-rules-variables)[![npm downloads](https://img.shields.io/npm/dm/postcss-at-rules-variables.svg?style=flat-square)](https://www.npmjs.com/package/postcss-at-rules-variables)
+[![Build Status](https://img.shields.io/travis/GitScrum/postcss-at-rules-variables.svg?style=flat-square)](https://travis-ci.org/GitScrum/postcss-at-rules-variables)[![npm version](https://img.shields.io/npm/v/postcss-at-rules-variables.svg?style=flat-square)](https://www.npmjs.com/package/postcss-at-rules-variables)[![David](https://img.shields.io/david/GitScrum/postcss-at-rules-variables.svg?style=flat-square)](https://github.com/GitScrum/postcss-at-rules-variables)[![npm downloads](https://img.shields.io/npm/dm/postcss-at-rules-variables.svg?style=flat-square)](https://www.npmjs.com/package/postcss-at-rules-variables)[![npm](https://img.shields.io/npm/dt/postcss-at-rules-variables.svg?style=flat-square)](https://www.npmjs.com/package/postcss-at-rules-variables)
 
 Used in conjunction with the plugin [postcss-each], [postcss-conditionals], [postcss-for] and more at-rules plugins.