fix($readme): add tip about removing style-loader

Author: faceyspacey

README.md

@@ -21,6 +21,7 @@
 </p>
 
 # extract-css-chunks-webpack-plugin
+> TIP: remove `style-loader` from your dependencies. It's included in this package and must resolve to the correct *latest* version (June 2017). 
 
 Like `extract-text-webpack-plugin`, but creates multiple css files (one per chunk). Then, as part of server side rendering, you can deliver just the css chunks needed by the current request. The result is the most minimal CSS initially served compared to emerging JS-in-CSS solutions.