Update Apple touch icons

views/index.erb

@@ -16,10 +16,13 @@
   <link rel="canonical" href="http://devdocs.io">
   <link rel="search" type="application/opensearchdescription+xml" href="/opensearch.xml" title="DevDocs Search">
   <link rel="icon" type="image/x-icon" href="http://maxcdn.devdocs.io/favicon.ico">
-  <link rel="apple-touch-icon" href="http://maxcdn.devdocs.io/images/apple-icon-57.png">
+  <link rel="apple-touch-icon" sizes="57x57" href="http://maxcdn.devdocs.io/images/apple-icon-57.png">
   <link rel="apple-touch-icon" sizes="72x72" href="http://maxcdn.devdocs.io/images/apple-icon-72.png">
+  <link rel="apple-touch-icon" sizes="76x76" href="http://maxcdn.devdocs.io/images/apple-icon-76.png">
   <link rel="apple-touch-icon" sizes="114x114" href="http://maxcdn.devdocs.io/images/apple-icon-114.png">
+  <link rel="apple-touch-icon" sizes="120x120" href="http://maxcdn.devdocs.io/images/apple-icon-120.png">
   <link rel="apple-touch-icon" sizes="144x144" href="http://maxcdn.devdocs.io/images/apple-icon-144.png">
+  <link rel="apple-touch-icon" sizes="152x152" href="http://maxcdn.devdocs.io/images/apple-icon-152.png">
   <%= stylesheet_tag 'application' %>
   <%= javascript_tag 'application', asset_host: false %>
   <%= javascript_tag 'docs' %><% unless App.production? %>