Update README.md

README.md

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+> _Deprecation notice:_
+> Consider [jsdom-global](https://github.com/rstacruz/jsdom-global) instead, a simpler alternative that also works outside of Mocha. `mocha-jsdom` still works, but `jsdom-global` is better supported.
+
+---
+
 # mocha-jsdom
 
-Test frontend libraries in the console using io.js, [mocha] and [jsdom].  
+> Test frontend libraries in the console using Node.js, [mocha] and [jsdom]. 
 
 [![Status](https://travis-ci.org/rstacruz/mocha-jsdom.svg?branch=master)](https://travis-ci.org/rstacruz/mocha-jsdom "See test builds")
 
-> Also consider [jsdom-global](https://github.com/rstacruz/jsdom-global), a simpler alternative that also works outside of Mocha.
-
 <br>
 
 ## Usage