associate_jsonb 0.0.3

This gem extends ActiveRecord to let you use PostgreSQL JSONB data for associations Inspired by activerecord-jsonb-associations, but for use in Rails 6+ and ruby 2.7+ and with some unnecessary options and features (HABTM) removed BONUS: extended `table#references` for easy migrations and indexes (NOTE: real foreign key constraints are not possible with PostgreSQL JSONB)