oracle autoIncrement doesn't work without generationType

Description

This change added autoIncrement support.
https://github.com/liquibase/liquibase/pull/416 ()
It seems this change made generationType required.
https://github.com/liquibase/liquibase/commit/0484d1ecc61b574aa16187bc6cbff58a2a3f6442

It would be nice if I didn't have to specify this undocumented field to get autoIncrement working on oraicle.
generationType: BY DEFAULT

It affects version 3.8.5 but I don't see that available as an option.

Environment

windows, oracle 12c, spring boot

Reporter

Stephen Buergler

Affects versions

Priority

Minor
Configure