[Release] v6.0.0

[rbondoc96]

Changelog

• Drop User model associations on tracked entities in favor of polymorphic "owner" associations.

Caution

This is a major version bump.

This version drops the user_id column from both the audit_changes and audit_models tables. That column as been replaced by the owner_type and owner_id columns in both tables.

Any projects that use this package will need to re-run migrations.