This PR updates [django](https://pypi.org/project/django) from **2.0.7** to **2.0.8**.
<details>
<summary>Changelog</summary>
### 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) (🎫`29544`).
* Fixed a regression where ``django.template.Template`` crashed if the
``template_string`` argument is lazy (🎫`29617`).
==========================
```
</details>
<details>
<summary>Links</summary>
- PyPI: https://pypi.org/project/django
- Changelog: https://pyup.io/changelogs/django/
- Homepage: https://www.djangoproject.com/
</details>
* Integrate Flower with Docker Compose setup locally
* Remove alien worker celeryd option
* Move Flower COPY section below the worker's
* Remove set -o pipefail command from Flower start script
* Flower client authentication
* Override flower service image name
* Move flower service to the end of local.yml
* Install flower==0.9.2 in all environments
* Introduce production flower service
* Fix local flower start script
* Document Flower integration
* Prettify *.django envs
Rationale: consistency.
* Reference local environment Flower docs from the production's
* 'two more services' -> 'three more services'
