[Travis] Add PHP 7.2
[Travis] Add PHP 7.2

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