Update README.md

README.md

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 # swiftconst
 
-[![Swift 5.0](https://img.shields.io/badge/swift-5.0-orange.svg?style=flat)](https://swift.org/download/)
+[![Swift 5.1](https://img.shields.io/badge/swift-5.1-orange.svg?style=flat)](https://swift.org/download/)
 [![Build Status](https://app.bitrise.io/app/f45d3e8ffa077288/status.svg?token=1oqaCoE9MuMQrWJnYh1Cjg&branch=master)](https://app.bitrise.io/app/f45d3e8ffa077288)
 [![codecov](https://codecov.io/gh/kitasuke/SwiftConst/branch/master/graph/badge.svg)](https://codecov.io/gh/kitasuke/SwiftConst)
 
@@ -13,8 +13,8 @@ This is highly inspired by [goconst](https://github.com/jgautheron/goconst) and
 
 ## Requirements
 
-Swift 5.0+  
-Xcode 10.2+
+Swift 5.1+  
+Xcode 11.0+ beta
 
 ## How to use