Fixes Travis.
Fixes Travis.

KyoheiG3/RxSwift,ReactiveX/RxSwift,thanegill/RxSwift,hsoi/RxSwift,cfraz89/RxSwift,hsoi/RxSwift,tottakai/RxSwift,hsoi/RxSwift,thanegill/RxSwift,cfraz89/RxSwift,shiratsu/RxSwift,cfraz89/RxSwift,KyoheiG3/RxSwift,kzaher/RxSwift,kzaher/RxSwift,tottakai/RxSwift,KyoheiG3/RxSwift,shiratsu/RxSwift,thanegill/RxSwift,kzaher/RxSwift,thanegill/RxSwift,hsoi/RxSwift,ReactiveX/RxSwift,ReactiveX/RxSwift,shiratsu/RxSwift,tottakai/RxSwift,kzaher/RxSwift,cfraz89/RxSwift