fix known security with handlebars

examples/timeline/styling/itemTemplates.html

@@ -4,7 +4,7 @@
   <title>Timeline | Templates</title>
 
   <!-- load handlebars for templating, and create a template -->
-  <script src="http://cdnjs.cloudflare.com/ajax/libs/handlebars.js/2.0.0-alpha.4/handlebars.min.js"></script>
+  <script src="http://cdnjs.cloudflare.com/ajax/libs/handlebars.js/4.0.5/handlebars.min.js"></script>
   <script id="item-template" type="text/x-handlebars-template">
     <table class="score">
       <tr>