Update django to 2.0.8

[pyup-bot]

This PR updates django from 2.0.7 to 2.0.8.

Changelog

2.0.8

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

*August 1, 2018*

Django 2.0.8 fixes a security issue and several bugs in 2.0.7.

CVE-2018-14574: Open redirect possibility in ``CommonMiddleware``
=================================================================

If the :class:`~django.middleware.common.CommonMiddleware` and the
:setting:`APPEND_SLASH` setting are both enabled, and if the project has a
URL pattern that accepts any path ending in a slash (many content management
systems have such a pattern), then a request to a maliciously crafted URL of
that site could lead to a redirect to another site, enabling phishing and other
attacks.

``CommonMiddleware`` now escapes leading slashes to prevent redirects to other
domains.

Bugfixes
========

* Fixed a regression in Django 2.0.7 that broke the ``regex`` lookup on MariaDB
(even though MariaDB isn't officially supported) (:ticket:`29544`).

* Fixed a regression where ``django.template.Template`` crashed if the
``template_string`` argument is lazy (:ticket:`29617`).


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

Links

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