Added .swift-version file
Added .swift-version file

tgyhlsb/RxSwiftExt,RxSwiftCommunity/RxSwift-Ext,RxSwiftCommunity/RxSwiftExt,tgyhlsb/RxSwiftExt,RxSwiftCommunity/RxSwiftExt,RxSwiftCommunity/RxSwift-Ext,RxSwiftCommunity/RxSwiftExt