add npm version badge

Author: bartveneman

readme.md

@@ -1,4 +1,7 @@
-# css-analyzer [![Build Status](https://travis-ci.org/projectwallace/css-analyzer.svg?branch=master)](https://travis-ci.org/projectwallace/css-analyzer) [![Known Vulnerabilities](https://snyk.io/test/github/projectwallace/css-analyzer/badge.svg)](https://snyk.io/test/github/projectwallace/css-analyzer) [![Coverage Status](https://coveralls.io/repos/github/projectwallace/css-analyzer/badge.svg?branch=master)](https://coveralls.io/github/projectwallace/css-analyzer?branch=master) ![Dependencies Status](https://img.shields.io/david/projectwallace/css-analyzer.svg) ![Dependencies Status](https://img.shields.io/david/dev/projectwallace/css-analyzer.svg) [![XO code style](https://img.shields.io/badge/code_style-XO-5ed9c7.svg)](https://github.com/sindresorhus/xo)
+# css-analyzer
+
+[![NPM Version](https://img.shields.io/npm/v/@projectwallace/css-analyzer.svg)](https://www.npmjs.com/package/@projectwallace/css-analyzer)
+[![Build Status](https://travis-ci.org/projectwallace/css-analyzer.svg?branch=master)](https://travis-ci.org/projectwallace/css-analyzer) [![Known Vulnerabilities](https://snyk.io/test/github/projectwallace/css-analyzer/badge.svg)](https://snyk.io/test/github/projectwallace/css-analyzer) [![Coverage Status](https://coveralls.io/repos/github/projectwallace/css-analyzer/badge.svg?branch=master)](https://coveralls.io/github/projectwallace/css-analyzer?branch=master) ![Dependencies Status](https://img.shields.io/david/projectwallace/css-analyzer.svg) ![Dependencies Status](https://img.shields.io/david/dev/projectwallace/css-analyzer.svg) [![XO code style](https://img.shields.io/badge/code_style-XO-5ed9c7.svg)](https://github.com/sindresorhus/xo)
 
 > Analyze your CSS