Updates from golang-migrate/migrate

After fork update: revert commands create_db and drop_db (#1)

* After fork update: revert commands create_db and drop_db

* flag.Usage fix

* flag.Usage fix

Co-authored-by: Konstantin Zhernosenko <konstantin.zhernosenko@humans.net>

added create drop db command for psql only

binaries include file and gitlab sources and postgres database only.