Use global hugo func

layouts/partials/head.html

@@ -3,7 +3,7 @@
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <meta http-equiv="X-UA-Compatible" content="IE=edge">
 
-  {{ .Hugo.Generator }}
+  {{ hugo.Generator }}
   <link rel="canonical" href="{{ .Permalink }}">
 
   {{ if .IsHome }}