change 'admin' url, to stay the same as generated by django 1.10

https://github.com/django/django/blob/1.10.1/django/conf/project_template/project_name/urls.py-tpl#L20

{{cookiecutter.project_slug}}/config/urls.py

@@ -13,7 +13,7 @@ urlpatterns = [
     url(r'^about/$', TemplateView.as_view(template_name='pages/about.html'), name='about'),
 
     # Django Admin, use {% raw %}{% url 'admin:index' %}{% endraw %}
-    url(settings.ADMIN_URL, include(admin.site.urls)),
+    url(settings.ADMIN_URL, admin.site.urls),
 
     # User management
     url(r'^users/', include('{{ cookiecutter.project_slug }}.users.urls', namespace='users')),