Bump django from 1.11.15 to 1.11.23 (#53)

Bumps [django](https://github.com/django/django) from 1.11.15 to 1.11.23.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@1.11.15...1.11.23)

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

Author: dependabot[bot]

requirements.txt

@@ -1,6 +1,6 @@
 certifi
 chardet==3.0.4
-django==1.11.15
+django==1.11.23
 django-redis==4.9.0
 django-rest-framework==0.1.0
 djangorestframework==3.8.2