0.17.8

Added

• Add Model.raw method to support the raw sql query.
• Add QuerySet.bulk_update method. (#924)
• Add QuerySet.in_bulk method.
• Add MaxValueValidator and MinValueValidator (#927)

Fixed

• Fix QuerySet subclass being lost when _clone is run on the instance.
• Fix bug in .values with source_field. (#844)
• Fix contrib.blacksheep exception handlers, use builtin json response. (#914)
• Fix Indexes defined in Meta class do not make use of exists parameter in their template (#928)

Changed

• Allow negative values with IntEnumField. (#889)
• Make .values() and .values_list() awaited return more consistent. (#899)