Add YUI 3 to list of users

Author: necolas

index.html

@@ -70,6 +70,7 @@ <h2 class="tagline">A modern, HTML5-ready alternative to CSS resets</h2>
                 <p class="txt-large">&hellip;as used by
                     <a href="http://twitter.github.com/bootstrap/">Twitter Bootstrap</a>,
                     <a href="http://html5boilerplate.com/">HTML5 Boilerplate</a>,
+                    <a href="http://yuilibrary.com/projects/yui3/">YUI 3</a>,
                     <a href="http://tweetdeck.com/">TweetDeck</a>,
                     <a href="https://soundcloud.com/">Soundcloud</a>,
                     <a href="https://medium.com/">Medium</a>,