Have given a quick look at the template code and I'm not sure of how {% load url from future %} is being used; might not create a problem if it's removed. Creating an alternative template without {% load url from future %} for Django > 1.9 users could be a quick fix? Will send a pull request.
I believe it's because of this: https://github.com/sehmaschine/django-grappelli/issues/648
Have given a quick look at the template code and I'm not sure of how {% load url from future %} is being used; might not create a problem if it's removed. Creating an alternative template without {% load url from future %} for Django > 1.9 users could be a quick fix? Will send a pull request.