Bump django from 2.2.5 to 2.2.24 (#390)

Bumps [django](https://github.com/django/django) from 2.2.5 to 2.2.24.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/2.2.5...2.2.24)

---
updated-dependencies:
- dependency-name: django
  dependency-type: direct:production
...

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setup.py

@@ -87,7 +87,7 @@ setup(
     ],
     include_package_data=True,
     install_requires=[
-        'django==2.2.5',
+        'django==2.2.24',
         'wagtail==2.11.8',
         'django-countries==5.5',
         'django-extensions==2.2.1',