load admin_static has been removed in Django 3.0

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Describe the problem

Trying to access the constance objects in Django 3.0.1 admin fails with

TemplateSyntaxError at /admin/constance/config/

'admin_static' is not a registered tag library. Must be one of:
admin_list
admin_modify
admin_urls
cache
i18n
l10n
log
static
tz

Steps to reproduce

Install constance and try to access it in the Django admin

System configuration

• Django version: 3.0.1
• Python version: 3.6.8

The staticfiles and admin_static template tag libraries are removed in Django 3. To fix this problem I just had to replace admin_static whith static in constance/templates/admin/constance/includes/results_list.html and constance/templates/admin/constance/change_list.html