Fix README typo

Author: stephencookdev

README.md

@@ -7,7 +7,7 @@
 
   <a href="https://travis-ci.org/stephencookdev/speed-measure-webpack-plugin"><img src="https://travis-ci.org/stephencookdev/speed-measure-webpack-plugin.svg?branch=master" /></a>
   <a href="https://npmjs.com/package/speed-measure-webpack-plugin"><img src="https://img.shields.io/npm/dw/speed-measure-webpack-plugin.svg" /></a>
-  <a href="https://npmmjs.com/package/speed-measure-webpack-plugin"><img src="https://img.shields.io/node/v/speed-measure-webpack-plugin.svg" /></a>
+  <a href="https://npmjs.com/package/speed-measure-webpack-plugin"><img src="https://img.shields.io/node/v/speed-measure-webpack-plugin.svg" /></a>
   <a href="https://github.com/prettier/prettier"><img src="https://img.shields.io/badge/code_style-prettier-ff69b4.svg" /></a>
 </div>
 <br>