Update Travis configuration
Update Travis configuration

davydovanton/celluloid,sideci-sample/sideci-sample-celluloid,kenichi/celluloid,seuros/celluloid,celluloid/celluloid,marshall-lee/celluloid,TiagoCardoso1983/celluloid,jasonm23/celluloid,jstoja/celluloid,olleolleolle/celluloid,dilumn/celluloid