Bump django-reversion from 3.0.3 to 3.0.4 in /src/requirements

Bumps [django-reversion](https://github.com/etianen/django-reversion) from 3.0.3 to 3.0.4.
- [Release notes](https://github.com/etianen/django-reversion/releases)
- [Changelog](https://github.com/etianen/django-reversion/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/etianen/django-reversion/compare/v3.0.3...v3.0.4)

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

src/requirements/production.txt

@@ -15,7 +15,7 @@ django-bleach==0.5.3
 django-bootstrap3==11.0.0
 django-extensions==2.1.9
 django-wkhtmltopdf==3.2.0
-django-reversion==3.0.3
+django-reversion==3.0.4
 django-betterforms==1.2
 django-cors-headers==2.5.2
 django-filter==2.1.0