Update readme.md

Author: SimonCropp

readme.md

@@ -1,7 +1,7 @@
 # <img src="/src/icon.png" height="30px"> Verify.TestableIO.System.IO.Abstractions
 
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 Extends [Verify](https://github.com/VerifyTests/Verify) to allow verification of [TestableIO.System.IO.Abstractions](https://github.com/TestableIO/System.IO.Abstractions) bits.<!-- singleLineInclude: intro. path: /docs/intro.include.md -->