[3.9.0 release process] Bumped version to 3.9.0
[3.9.0 release process] Bumped version to 3.9.0

divio/django-cms,divio/django-cms,rsalmaso/django-cms,divio/django-cms,divio/django-cms,datakortet/django-cms,datakortet/django-cms,rsalmaso/django-cms,datakortet/django-cms,datakortet/django-cms,rsalmaso/django-cms,rsalmaso/django-cms