Adds clean-css logo to top of readme.

Author: jakubpawlowicz

README.md

@@ -1,3 +1,10 @@
+<h1 align="center">
+  <br/>
+  <img src="https://cdn.rawgit.com/jakubpawlowicz/clean-css/master/logo.v2.svg" alt="clean-css logo" width="525px"/>
+  <br/>
+  <br/>
+</h1>
+
 [![NPM version](https://img.shields.io/npm/v/clean-css-cli.svg?style=flat)](https://www.npmjs.com/package/clean-css)
 [![Linux Build Status](https://img.shields.io/travis/jakubpawlowicz/clean-css-cli/master.svg?style=flat&label=Linux%20build)](https://travis-ci.org/jakubpawlowicz/clean-css)
 [![Dependency Status](https://img.shields.io/david/jakubpawlowicz/clean-css-cli.svg?style=flat)](https://david-dm.org/jakubpawlowicz/clean-css)