Bump django from 1.6.11 to 1.11.29 in /dipher

Bumps [django](https://github.com/django/django) from 1.6.11 to 1.11.29.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@1.6.11...1.11.29)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

dipher/requirements.txt

@@ -4,7 +4,7 @@ Cactus==3.3.3
 colorama==0.4.3
 colorlog==4.1.0
 dj-database-url==0.5.0
-Django==1.6.11
+Django==1.11.29
 django-crispy-forms==1.9.1
 django-heroku==0.3.1
 django-markwhat==1.6.2