Merge pull request #132 from coderdojo-japan/add-time-based-hash-to-flush-cache

Add time-based URL param for stylesheet to flush cache in web browsers

Author: kp54

_includes/head.html

@@ -64,5 +64,5 @@
 
   <!-- CSS -------------------------- -->
   <!-- DojoCon CSS -->
-  <link rel="stylesheet" href="/css/main.css?3ba454d" />
+  <link rel="stylesheet" href="/css/main.css?v={{ 'now' | date: '%Y%m%d-%H%M%S' }}" />
 </head>