[PyUP] Update django-appconf to 1.0.4

[pyup-bot]

This PR updates django-appconf from 1.0.2 to 1.0.4.

Changelog

1.0.4

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* Run tests for Django 2.2 and 3.0 and Python 3.5, 3.6, 3.7 and 3.8

* Add template and middleware settings in test_settings (required for Django 2.2)

1.0.3

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Packaging metadata updates:

* Update tox configuration to match Django Python support map

* Drop support for Django 1.8, 1.9 and 1.10
* Drop support for python 3.3

* Confirm support for Django 1.11, 2.0 and 2.1
* Confirm support for python 3.7

Links

• PyPI: https://pypi.org/project/django-appconf
• Changelog: https://pyup.io/changelogs/django-appconf/
• Docs: https://django-appconf.readthedocs.io/

[pyup-bot]

Closing this in favor of #509