Add Safari Pinned Tab icon

Author: yasulab

app/views/layouts/application.html.erb

@@ -43,10 +43,11 @@
   <link rel="apple-touch-icon" sizes="152x152" href="/img/apple-icon-152x152.png">
   <link rel="apple-touch-icon" sizes="180x180" href="/img/apple-icon-180x180.png">
   <link rel="icon" type="image/png" sizes="192x192"  href="/img/android-icon-192x192.png">
+  <link rel="icon" type="image/png" sizes="16x16"    href="/img/favicon-16x16.png">  
   <link rel="icon" type="image/png" sizes="32x32"    href="/img/favicon-32x32.png">
   <link rel="icon" type="image/png" sizes="96x96"    href="/img/favicon-96x96.png">
-  <link rel="icon" type="image/png" sizes="16x16"    href="/img/favicon-16x16.png">
-  <link rel="manifest" href="/manifest.json">
+  <link rel="manifest"  href="/manifest.json">
+  <link rel="mask-icon" href="/img/safari-pinned-tab.svg" color="#1373ce">
   <meta name="msapplication-TileColor" content="#ffffff">
   <meta name="msapplication-TileImage" content="/img/ms-icon-144x144.png">
   <meta name="theme-color"             content="#ffffff">