Bump django from 1.9.8 to 1.11.23

Bumps [django](https://github.com/django/django) from 1.9.8 to 1.11.23.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@1.9.8...1.11.23)

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

Author: dependabot[bot]

requirements.txt

@@ -1,3 +1,3 @@
-Django==1.9.8
+Django==1.11.23
 djangorestframework==3.4.0
 django-cors-headers==1.1.0