Bump django-appconf from 1.0.3 to 1.0.4

Bumps [django-appconf](https://github.com/django-compressor/django-appconf) from 1.0.3 to 1.0.4.
- [Release notes](https://github.com/django-compressor/django-appconf/releases)
- [Changelog](https://github.com/django-compressor/django-appconf/blob/develop/docs/changelog.rst)
- [Commits](django-compressor/django-appconf@1.0.3...v1.0.4)

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

requirements.txt

@@ -4,7 +4,7 @@ cffi==1.13.1
 chardet==3.0.4
 contextlib2==0.5.5
 Django==2.2.13
-django-appconf==1.0.3
+django-appconf==1.0.4
 django-cacheops==5.0.1
 django-compressor==2.2
 django-debug-toolbar==2.2