UseTransaction should be true by default

[qustavo]

I have a mult-steps migration like:

return &gormigrate.Migration{
	Migrate: func(tx *gorm.DB) error {
		// This creates the table successfully
		if err := tx.Migrator().CreateTable("table1"); err != nil {
			return err
		}

		// Failure happens here
		return migrator.CreateTable("table2")
	},
}

Running this result in a partial failure; part of the migration is executed with no problem but it fails after.
The result is that I end up with a corrupt migration state. Since this can happen and can lead to potential bugs and or manual intervention to correct the db state, I believe that by default migrations should run inside a tx unless it is stated otherwise.
This will be simply fixed by making DefaultConfiguration return UseTransaction: true