Update README.md

Author: stephencelis

README.md

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 # 📸 SnapshotTesting
 
-[![Swift 5.1](https://img.shields.io/badge/swift-5.1-ED523F.svg?style=flat)](https://swift.org/download/)
 [![CI](https://github.com/pointfreeco/swift-snapshot-testing/workflows/CI/badge.svg)](https://actions-badge.atrox.dev/pointfreeco/swift-snapshot-testing/goto)
-[![@pointfreeco](https://img.shields.io/badge/[email protected]?style=flat)](https://twitter.com/pointfreeco)
+[![](https://img.shields.io/endpoint?url=https%3A%2F%2Fswiftpackageindex.com%2Fapi%2Fpackages%2Fpointfreeco%2Fswift-snapshot-testing%2Fbadge%3Ftype%3Dswift-versions)](https://swiftpackageindex.com/pointfreeco/swift-snapshot-testing)
+[![](https://img.shields.io/endpoint?url=https%3A%2F%2Fswiftpackageindex.com%2Fapi%2Fpackages%2Fpointfreeco%2Fswift-snapshot-testing%2Fbadge%3Ftype%3Dplatforms)](https://swiftpackageindex.com/pointfreeco/swift-snapshot-testing)
 
 Delightful Swift snapshot testing.