chore(travis): faster build turnaround (#2236)
chore(travis): faster build turnaround (#2236)


ReactiveX/RxJS,SangKa/RxJS-Docs-CN,staltz/RxJSNext,ReactiveX/RxJS,staltz/RxJSNext,staltz/RxJSNext,jayphelps/rxjs,SangKa/RxJS-Docs-CN,benlesh/RxJS,trxcllnt/RxJS,staltz/RxJSNext,RxJS-CN/RxJS-Docs-CN,Brocco/RxJS,benlesh/RxJS,jayphelps/rxjs,ReactiveX/RxJS,IgorMinar/RxJS,kwonoj/RxJS,trxcllnt/RxJS,ReactiveX/rxjs,ReactiveX/RxJS,trxcllnt/RxJS,martinsik/rxjs,Brocco/RxJS,benlesh/RxJS,ReactiveX/rxjs,kwonoj/RxJS,martinsik/rxjs,jayphelps/rxjs,ReactiveX/rxjs,Brocco/RxJS,SangKa/RxJS-Docs-CN,kwonoj/RxJS,jayphelps/rxjs,martinsik/rxjs,IgorMinar/RxJS,kwonoj/RxJS,benlesh/RxJS,ReactiveX/rxjs,RxJS-CN/RxJS-Docs-CN,RxJS-CN/RxJS-Docs-CN,jayphelps/rxjs,RxJS-CN/RxJS-Docs-CN,martinsik/rxjs,Brocco/RxJS,SangKa/RxJS-Docs-CN,trxcllnt/RxJS