Bump django from 1.6.5 to 2.2.24

Bumps [django](https://github.com/django/django) from 1.6.5 to 2.2.24.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@1.6.5...2.2.24)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -1,4 +1,4 @@
-Django==1.6.5
+Django==2.2.24
 dj-database-url==0.3.0
 dj-static==0.0.5
 django-redis-cache==1.6.0