protocols are nice

website/templates/_make.html

@@ -7,7 +7,7 @@
       <p>TimelineJS works on any site or blog. Make your own in four easy steps. (<a href="http://www.youtube.com/watch?v=vAWbm4gF9lU">video tutorial</a>)</p>
       <div id="body-teaser">
         <p><span class="new">New!</span>There's a new version of TimelineJS that is now available for beta testing. TimelineJS 3 is a full rewrite designed to make this popular tool more flexible for authors and developers.</p>
-        <a class="btn btn-success" href="timeline3.knightlab.com">Try TimelineJS 3 now »</a>
+        <a class="btn btn-success" href="https://timeline3.knightlab.com">Try TimelineJS 3 now »</a>
       </div>
   </div>