update pod spec to use RxCocoa
update pod spec to use RxCocoa

bontoJR/RxAlamofire,RxSwiftCommunity/RxAlamofire,bontoJR/RxAlamofire,RxSwiftCommunity/RxAlamofire,gaplo917/RxAlamofire,gaplo917/RxAlamofire,RxSwiftCommunity/RxAlamofire,gaplo917/RxAlamofire,gaplo917/RxAlamofire