Update README.md

README.md

@@ -197,3 +197,5 @@ The original **gui.cs** was a UI toolkit in a single file and tied to curses. Th
 A presentation of this was part of the [Retro.NET](https://channel9.msdn.com/Events/dotnetConf/2018/S313) talk at .NET Conf 2018 [Slides](https://tirania.org/Retro.pdf)
 
 Release history can be found in the [Terminal.Gui.csproj](https://github.com/migueldeicaza/gui.cs/blob/master/Terminal.Gui/Terminal.Gui.csproj) file.
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+In 2019 and 2020, Charlie Kindel (https://github.com/tig) and @BDisp (https://github.com/BDisp) vastly extended, improved, polished and fixed gui.cs to what it is today.