Bump django from 2.2.2 to 2.2.8

Bumps [django](https://github.com/django/django) from 2.2.2 to 2.2.8.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@2.2.2...2.2.8)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements.txt

@@ -1,7 +1,7 @@
 certifi==2019.6.16
 cloudinary==1.12.0
 dj-database-url==0.5.0
-Django==2.2.2
+Django==2.2.8
 django-ckeditor==5.5.0
 django-heroku==0.3.1
 django-rest-framework==0.1.0