Update dependency Django to v3

Thalia Technicie
2020-02-05T12:23:30+01:00

This MR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [Django](https://www.djangoproject.com/) ([source](https://github.com/django/django), [changelog](https://github.com/django/django/tree...

This MR contains the following updates:

Package | Type | Update | Change
Django (source, changelog) | dependencies | major | 2.2.9 -> 3.0.2

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