Update README.md

Author: GrahamTheCoder

README.md

@@ -3,7 +3,7 @@
 Convert code from VB.NET to C# and vice versa using Roslyn - all free and open source:
 * [Visual Studio extension](https://marketplace.visualstudio.com/items?itemName=SharpDevelopTeam.CodeConverter)
 * [Online snippet converter](https://codeconverter.icsharpcode.net/)
-* Command line `dotnet tool install ICSharpCode.CodeConverter.codeconv --global` (Requires VS2017+ installed)
+* Command line `dotnet tool install ICSharpCode.CodeConverter.codeconv --global` (Requires VS2019+ installed)
 * [Nuget library](https://www.nuget.org/packages/ICSharpCode.CodeConverter/) (this underpins all other free converters you'll find online)
 
 See [wiki](https://github.com/icsharpcode/CodeConverter/wiki) for advice on getting the best results.