Update README.md

Author: krauthaufen

README.md

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-[![CI - Windows](https://github.com/fsprojects/FSharp.Data.Adaptive/workflows/CI%20-%20Windows/badge.svg?branch=master)](https://github.com/fsprojects/FSharp.Data.Adaptive/actions/workflows/windows.yml)
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 # FSharp.Data.Adaptive
 
 FSharp.Data.Adaptive provides a clean API for handling changeable ("adaptive") data while sticking to *functional* principles. It allows programmers to treat adaptive values just like immutable data while still maintaining efficient updates. Many adaptive data structures and operators are provided.