Update django to 3.0.5

[pyup-bot]

This PR updates Django from 3.0.4 to 3.0.5.

Changelog

3.0.5

==========================

*April 1, 2020*

Django 3.0.5 fixes several bugs in 3.0.4.

Bugfixes
========

* Added the ability to handle ``.po`` files containing different plural
equations for the same language (:ticket:`30439`).

* Fixed a regression in Django 3.0 where ``QuerySet.values()`` and
``values_list()`` crashed if a queryset contained an aggregation and
``Subquery()`` annotation that collides with a field name (:ticket:`31377`).


==========================

Links

• PyPI: https://pypi.org/project/django
• Changelog: https://pyup.io/changelogs/django/
• Homepage: https://www.djangoproject.com/

[atodorov]

There's some weird issue with Travis CI. All jobs are completed but the status wasn't updated. I've seen this on other repositories too but it was solved by restarting some of the jobs. Here that didn't help.