Add GOV.UK to list of sites using normalize

Author: necolas

index.html

@@ -61,6 +61,7 @@ <h2>Who uses it?</h2>
             <ul>
                 <li><a href="http://html5boilerplate.com/">HTML5 Boilerplate</a></li>
                 <li><a href="http://twitter.github.com/bootstrap/">Twitter Bootstrap</a></li>
+                <li><a href="https://www.gov.uk/">GOV.UK</a></li>
                 <li><a href="http://css-tricks.com/">CSS Tricks</a></li>
             </ul>