Bump django from 1.6.2 to 2.2.24

Bumps [django](https://github.com/django/django) from 1.6.2 to 2.2.24.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@1.6.2...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==1.6.2
+Django==2.2.24
 python-twitter==0.8.2
 markdown==2.0.3
 git+git://github.com/dominno/django-moderation.git