bulk_insert v1.9.0 Release Notes

    • ➕ Add CI test coverage for Rails 3-6 and Ruby 2.2-2.7 (#72) [@mberlanda]
    • ➕ Add CI mysql test coverage (#74 #75 #76 #77) [@mberlanda]
    • ⏪ Restore rails < 5 mysql support (#78) [@mberlanda]
    • ➕ Add CI postgresql test coverage (#79) [@mberlanda]