Update README.md

Author: colemancda

README.md

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 # CoreModel
 
-[![Swift](https://img.shields.io/badge/swift-5.7-orange.svg?style=flat)](https://developer.apple.com/swift/)
+[![Swift](https://img.shields.io/badge/swift-6.0-orange.svg?style=flat)](https://developer.apple.com/swift/)
 [![License MIT](https://img.shields.io/badge/License-MIT-blue.svg?style=flat)](https://tldrlegal.com/license/mit-license)
 [![Release](https://img.shields.io/github/release/pureswift/CoreModel.svg)](https://github.com/PureSwift/CoreModel/releases)