Add .NET 9.0 as supported platform to README. (#453)

README.md

@@ -10,7 +10,7 @@ Reqnroll is a .NET port of [Cucumber](https://cucumber.io/) and it is based on t
 
 Reqnroll enables writing executable specifications for BDD using [Gherkin](https://cucumber.io/docs/gherkin/), the widely-accepted *feature file* specification format. With that you can define the requirements using *Given-When-Then* style *scenarios* and turn them to automated tests in order to verify their implementation.
 
-Reqnroll works on all major operating systems (Windows, Linux, macOS), on all commonly used .NET implementations (including .NET Framework 4.6.2+ and .NET 8.0). For executing the automated scenarios, Reqnroll can use [MsTest](https://learn.microsoft.com/en-us/dotnet/core/testing/unit-testing-with-mstest), [NUnit](https://nunit.org/) or [xUnit](https://xunit.net/). On Reqnroll projects you can work using Visual Studio 2022, Visual Studio Core and Rider, but you can also use Reqnroll without any IDE.
+Reqnroll works on all major operating systems (Windows, Linux, macOS), on all commonly used .NET implementations (including .NET Framework 4.6.2+ and up to .NET 9.0). For executing the automated scenarios, Reqnroll can use [MsTest](https://learn.microsoft.com/en-us/dotnet/core/testing/unit-testing-with-mstest), [NUnit](https://nunit.org/) or [xUnit](https://xunit.net/). On Reqnroll projects you can work using Visual Studio 2022, Visual Studio Core and Rider, but you can also use Reqnroll without any IDE.
 
 ## Useful links