Update README.md

Author: rlamana

README.md

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 Ventus WM [![Build Status](https://travis-ci.org/rlamana/Ventus.svg?branch=master)](https://travis-ci.org/rlamana/Ventus)
 ===========================
 
-A window manager experiment written in Javascript, HTML5 and CSS3.
+A window manager written in Javascript, HTML5 and CSS3.
 
 <a href="http://www.rlamana.es/ventus">Live Demo!</a> (http://www.rlamana.es/ventus) | <a href="https://vimeo.com/62041866">Video Demo</a>