add div to header layout

layouts/partials/header.html

@@ -1,6 +1,8 @@
+<div>
 {{ with resources.Get site.Params.logo.src }}
   <img src="{{ .RelPermalink }}" width="{{ .Width }}" height="{{ .Height }}" alt="{{ site.Params.logo.alt }}">
 {{ else }}
   <h1>{{ site.Title }}</h1>
 {{ end }}
 {{ partial "menu.html" (dict "menuID" "main" "page" .) }}
+</div>