1.9.0

Added

• python3.9 support
• django3.1 support
• added rest.ModelViewSetPermission django-rest-framework permission class
• added grainy_namespace property to decorated models
• added util.check_permissions helper function
• added util.get_permissions helper function
• added GRAINY_ANONYMOUS_GROUP setting

Fixed

• fix django-admin user and group admin view unregister
• fix instance namespacing on decorated models that have a grainy parent defined

Changed

• grainy handler classes moved to handlers.py to prevent circular depdendency issue