Update django-test-plus to 1.1.1

[pyup-bot]

This PR updates django-test-plus from 1.0.15 to 1.1.1.

Changelog

1.1.1

- Fix premature loading of Django settings under pytest

1.1.0

- Added real pytest fixture support! 
- Stopped testing support below Django 1.11.x. django-test-plus should probably continue to work for a long time, but Django 1.11 is the only pre-2.x version that is still supported so all we are going to worry about.
- Moved README and docs to Markdown

version 1.0.22 - January 9th, 2018

- Fix bug where we did not pass data dictionary to RequestFactory.get() properly

1.0.21

- Add response_204 method

1.0.20

- The Halloween Release!
- Fixes to CI to ensure we really test Django 2.0

1.0.19

- Django 2.0 support
- Dropped support for Python 3.3
- Dropped support for Django < 1.8
- Added APITestCase for better DRF testing

1.0.18

- Allow custom Request objects in get() and post()
- Begin testing against Python 3.6 and Django 1.11

1.0.17

- Added assertResponseHeaders

1.0.16

- Added print_form_errors utility

Links

• PyPI: https://pypi.org/project/django-test-plus
• Changelog: https://pyup.io/changelogs/django-test-plus/
• Repo: https://github.com/revsys/django-test-plus/