chore(travis): use latest npm
chore(travis): use latest npm

angular/batarang,jbnicolai/batarang,iegik/batarang,seawenzhu/batarang,vanessayuenn/batarang,hitesh97/batarang,iegik/batarang,jbnicolai/batarang,iegik/batarang,angular/batarang,vanessayuenn/batarang,DrewML/batarang,seawenzhu/batarang,jbnicolai/batarang,vanessayuenn/batarang,DrewML/batarang,hitesh97/batarang,hitesh97/batarang,seawenzhu/batarang,angular/batarang,DrewML/batarang