Drop abstract migration class
Drop abstract migration class

nikgo/bolt,GawainLynch/bolt,GawainLynch/bolt,romulo1984/bolt,GawainLynch/bolt,GawainLynch/bolt,romulo1984/bolt,bolt/bolt,bolt/bolt,romulo1984/bolt,nikgo/bolt,bolt/bolt,romulo1984/bolt,bolt/bolt,nikgo/bolt,nikgo/bolt