Ryuta Kamizono db077e8090 Allow using Action Mailbox on MySQL 5.5 ... Active Record still support MySQL 5.5 which doesn't support datetime with precision. 9e34df0003/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb (L99-L101) So we should check `supports_datetime_with_precision?` on the connection.		2019-01-18 07:04:08 +09:00
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20180917164000_create_action_mailbox_tables.rb	Allow using Action Mailbox on MySQL 5.5	2019-01-18 07:04:08 +09:00