chore(deps): bump django from 2.0.13 to 2.2.13

Bumps [django](https://github.com/django/django) from 2.0.13 to 2.2.13.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@2.0.13...2.2.13)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements.txt

@@ -11,7 +11,7 @@ django-livefield==3.1.0
 django-redis==4.10.0
 django-storages==1.7.1
 django-timezone-utils==0.13
-Django==2.0.13
+Django==2.2.13
 djangorestframework-hstore==1.3
 djangorestframework==3.7.7
 dnspython==1.15.0