Bump django-grappelli from 3.0.7 to 3.0.8

Bumps [django-grappelli](https://github.com/sehmaschine/django-grappelli) from 3.0.7 to 3.0.8.
- [Changelog](https://github.com/sehmaschine/django-grappelli/blob/master/docs/changelog.rst)
- [Commits](sehmaschine/django-grappelli@3.0.7...3.0.8)

---
updated-dependencies:
- dependency-name: django-grappelli
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

requirements.txt

@@ -44,7 +44,7 @@ django-downloadview==2.3.0
 django-polymorphic==3.1.0
 django-tastypie<0.15.0
 django-tinymce==3.6.1
-django-grappelli==3.0.7
+django-grappelli==3.0.8
 django-uuid-upload-path==1.0.0
 django-widget-tweaks==1.5.0
 django-sequences==2.8