site/layouts/partials/navbar-version-selector.html

<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
	{{ .Site.Params.version_menu }}
</a>
<div class="dropdown-menu dropdown-menu-md-right dropdown-menu-lg-left" aria-labelledby="navbarDropdownMenuLink">
	{{ range .Site.Params.versions }}
	<a class="dropdown-item" href="{{ .url }}">{{ .version }}</a>
	{{ end }}
</div>