docs: update README badges (#689)

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README.md

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 This library is a feature complete testing helper for the [IFileSystem abstractions for I/O-related functionality](https://github.com/TestableIO/System.IO.Abstractions) from the `System.IO` namespace. It uses an in-memory file system that behaves exactly like the real file system and can be used in unit tests for dependency injection.  
 The testing helper also supports advanced scenarios like