Remove Node.js v7 warning

Fixes webpack#820

Author: SpaceK33z

README.md

@@ -19,8 +19,6 @@ Use [webpack](https://webpack.js.org) with a development server that provides li
 
 It uses [webpack-dev-middleware](https://github.com/webpack/webpack-dev-middleware) under the hood, which provides fast in-memory access to the webpack assets.
 
-**Note: There are known issues with Node.js v7 and webpack / webpack-dev-server. Please use Node.js v6 for the moment.**
-
 <h2 align="center">Install</h2>
 
 ```