Bump django from 1.8 to 1.11.23 in /example
Bump django from 1.8 to 1.11.23 in /example

Bumps [django](https://github.com/django/django) from 1.8 to 1.11.23.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/1.8...1.11.23)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
bellhops/django-descriptive-id