Update README.md (#345)

Usage section was rendering as "Usage Usage" class="icon-link" href="#usage">", removed the link, to make it consistent with source and rendering for css-loader for example.

Author: MattGurneyAMP

README.md

@@ -18,7 +18,7 @@
 npm install style-loader --save-dev
 ```
 
-<h2 align="center"><a href="https://webpack.js.org/concepts/loaders">Usage</a></h2>
+<h2 align="center">Usage</h2>
 
 It's recommended to combine `style-loader` with the [`css-loader`](https://github.com/webpack/css-loader)