Compatibility with djangoadmin_reorder

[pakal]

Just in case someone stumbles on this :

the sorting page doesn't get updated by djangoadmin_reorder, because it uses direct render and not template reponse ;

so one should replace in dminsortable\admin.py :

return render(request, self.sortable_change_list_template, context)

with

return TemplateResponse(request, self.sortable_change_list_template, context)

to make everything work again