Merge pull request #351 from borro0/patch-1

Update README.md with new dotnet version

Author: usr3-1415

README.md

@@ -25,9 +25,9 @@ Compilation
 First, install the Java JRE. This is a compile-time only dependency,
 required to execute ANTLR.
 
-## Install .NET SDK (version 7.0)
+## Install .NET SDK (version 9.0)
 
-Install the [.NET 7.0](https://dotnet.microsoft.com/download/dotnet/7.0) sdk.
+Install the [.NET 9.0](https://dotnet.microsoft.com/download/dotnet/9.0) sdk.
 Add NuGet package source (in case it is missing) by executing:
 
     dotnet nuget add source "https://api.nuget.org/v3/index.json" --name "NuGet"