Update readme

Author: reloni

Readme.md

@@ -9,8 +9,8 @@ RxHttpClient
 RxHttpClient is a "reactive wrapper" around NSURLSession. Under the hood it implements session delegates (like NSURLSessionDelegate or NSURLSessionTaskDelegate) and translates session events into Observables using [RxSwift](https://github.com/ReactiveX/RxSwift). Main purpose of this framework is to make "streaming" data as simple as possible and provide convenient features for caching data.
 
 ## Requirements
-- Xcode 9.0
-- Swift 4.0
+- Xcode 10.0
+- Swift 4.2
 
 ## Installation
 Now only [Carthage](https://github.com/Carthage/Carthage) supported: