Fix fonts

Author: brentyi

_includes/head.html

@@ -10,7 +10,7 @@
   <link rel="stylesheet" href="{{ "/css/main.css" | prepend: site.baseurl }}">
 
   <!-- Google fonts -->
-  <link href='http://fonts.googleapis.com/css?family=Roboto:400,300' rel='stylesheet' type='text/css'>
+  <link href='https://fonts.googleapis.com/css?family=Roboto:400,300' rel='stylesheet' type='text/css'>
 
   <!-- Google tracking -->
   <script>