Update Readme.md

Author: Dirkster99

Readme.md

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+[![Release](https://img.shields.io/github/release/Dirkster99/UnitComboLib.svg.svg)](https://github.com/Dirkster99/UnitComboLib/releases/latest)
 [![NuGet](https://img.shields.io/nuget/dt/Dirkster.UnitComboLib.svg)](http://nuget.org/packages/Dirkster.UnitComboLib)
 
 # Overview
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 The control is also used in Edi:
 https://github.com/Dirkster99/Edi
-
-and available on NuGet: https://preview.nuget.org/packages/Dirkster.UnitComboLib/