Bump django from 1.10.8 to 1.11.28 in /docs (#49)
Bump django from 1.10.8 to 1.11.28 in /docs (#49)

Bumps [django](https://github.com/django/django) from 1.10.8 to 1.11.28.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/1.10.8...1.11.28)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
Bearle/django-private-chat,Bearle/django-private-chat,Bearle/django-private-chat