Update H1.

I think a colon looks better than the en dash for the H1. What do you
think?

Author: csswizardry

demo/index.html

@@ -211,7 +211,7 @@
   </svg>
 
   <hgroup>
-    <h1>Obs.js – context-aware web performance for everyone</h1>
+    <h1>Obs.js: context-aware web performance for everyone</h1>
     <p><em>Meet your users where they are</em></p>
   </hgroup>