Update README.md

Author: swhitty

README.md

@@ -1,9 +1,7 @@
 [![Build](https://github.com/swhitty/swift-mutex/actions/workflows/build.yml/badge.svg)](https://github.com/swhitty/swift-mutex/actions/workflows/build.yml)
 [![Codecov](https://codecov.io/gh/swhitty/swift-mutex/graphs/badge.svg)](https://codecov.io/gh/swhitty/swift-mutex)
-[![Platforms](https://img.shields.io/badge/platforms-iOS%20|%20Mac%20|%20tvOS%20|%20Linux%20|%20Windows-lightgray.svg)](https://github.com/swhitty/swift-mutex/blob/main/Package.swift)
-[![Swift 5.10](https://img.shields.io/badge/swift-5.9%20–%206.0-red.svg?style=flat)](https://developer.apple.com/swift)
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 # Introduction