React to .NET branding update

[gfoidl]

In

Stochastics/source/gfoidl.Stochastics/RuntimeHelper.cs

Lines 10 to 19 in e9e04cc

	public static bool IsRunningOnDotNetCore()
	{
	if (!_isRunningOnDotNetCore.HasValue)
	{
	string frameworkName = Assembly.GetEntryAssembly()?.GetCustomAttribute<TargetFrameworkAttribute>()?.FrameworkName;
	_isRunningOnDotNetCore = frameworkName?.Contains("NETCoreApp") ?? false;
	}
	return _isRunningOnDotNetCore.Value;
	}

make sure that .NET 5 will be known.

Cf. dotnet/runtime#33680

[ericstj]

This actually didn't change as behind the scenes TargetFrameworkIdentifier (from which this attribute value is built) remains NETCoreApp. cc @ViktorHofer

[gfoidl]

Thanks for the info -- I didn't notice this.

I'll leave the issue open, as reminder for me, because (now) I believe there are better ways to detect features provided by .NET Core 3 / .NET 5.