chore(travis): enable 'next' builds
chore(travis): enable 'next' builds

benbraou/flex-layout,angular/flex-layout,benbraou/flex-layout,atscott/flex-layout,benbraou/flex-layout,atscott/flex-layout,angular/flex-layout,atscott/flex-layout,angular/flex-layout,angular/flex-layout,benbraou/flex-layout,atscott/flex-layout