Update django-debug-toolbar to 1.9

[pyup-bot]

There's a new version of django-debug-toolbar available.
You are currently using 1.8. I have updated it to 1.9

These links might come in handy: PyPI | Changelog | Repo

Changelog

1.9

---

This version is compatible with Django 2.0 and requires Django 1.8 or
later.

Bugfixes

• The profiling panel now escapes reported data resulting in valid HTML.
• Many minor cleanups and bugfixes.

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖

[coveralls]

Coverage remained the same at 100.0% when pulling e1dc6a6 on pyup-update-django-debug-toolbar-1.8-to-1.9 into 659440e on master.

[pyup-bot]

Closing this in favor of #131