Update django to 2.0.7

[pyup-bot]

This PR updates django from 2.0.6 to 2.0.7.

Changelog

2.0.7

==========================

*July 2, 2018*

Django 2.0.7 fixes several bugs in 2.0.6.

Bugfixes
========

* Fixed admin changelist crash when using a query expression without ``asc()``
or ``desc()`` in the page's ordering (:ticket:`29428`).

* Fixed admin check crash when using a query expression in
``ModelAdmin.ordering`` (:ticket:`29428`).

* Fixed ``__regex`` and ``__iregex`` lookups with MySQL 8 (:ticket:`29451`).

* Fixed migrations crash with namespace packages on Python 3.7
(:ticket:`28814`).


==========================

Links

• PyPI: https://pypi.org/project/django
• Changelog: https://pyup.io/changelogs/django/
• Homepage: https://www.djangoproject.com/

[coveralls]

Pull Request Test Coverage Report for Build 861

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.503%

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Totals
Change from base Build 859:	0.0%
Covered Lines:	2202
Relevant Lines:	2213

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💛 - Coveralls