Removes link to Twitter profile as we won't be using it anymore.

Author: jakubpawlowicz

README.md

@@ -9,7 +9,6 @@
 ![x86 Linux build](https://github.com/jakubpawlowicz/clean-css-cli/workflows/x86%20Linux%20build/badge.svg)
 [![Dependency Status](https://img.shields.io/david/jakubpawlowicz/clean-css-cli.svg?style=flat)](https://david-dm.org/jakubpawlowicz/clean-css-cli)
 [![NPM Downloads](https://img.shields.io/npm/dm/clean-css-cli.svg)](https://www.npmjs.com/package/clean-css-cli)
-[![Twitter](https://img.shields.io/badge/Twitter-@cleancss-blue.svg)](https://twitter.com/cleancss)
 
 clean-css-cli is a command-line interface to [clean-css](https://github.com/jakubpawlowicz/clean-css) - fast and efficient CSS optimizer for [Node.js](http://nodejs.org/).