Bump django from 1.11.28 to 1.11.29

Bumps [django](https://github.com/django/django) from 1.11.28 to 1.11.29.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@1.11.28...1.11.29)

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

Author: dependabot[bot]

requirements.txt

@@ -1,7 +1,7 @@
 amqp==2.2.1
 billiard==3.5.0.3
 celery==4.1.0
-Django==1.11.28
+Django==1.11.29
 django-celery-beat==1.0.1
 django-crispy-forms==1.6.1
 kombu==4.1.0