URL
Returns the relative permalink of the page associated with the given menu entry, else its 
url property.Syntax
MENUENTRY.URL
Returns
string
For menu entries associated with a page, the URL method returns the page’s RelPermalink, otherwise it returns the entry’s url property.
<ul>
  {{ range .Site.Menus.main }}
    <li><a href="{{ .URL }}">{{ .Name }}</a></li>
  {{ end }}
</ul>