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[Bryan Lim]

Hi there, thank you for rails_db gem

I just want to report that the issue #114 still affects rails 5.2.4.2

rails_db 2.3.x is required to fix #114 in Rails 5.x. Thus, it's inaccurate to recommend rails_db 2.2.x for less than Rails 6.

The readme may need to update to reflect this change. Maybe users should just use 2.3.x for all rails version?