Incorrect Processor Information.

This is a really minor one, but hey, perfection right.

The Intel Core i9-7900X is reported as belonging to the Kaby Lake family (https://ark.intel.com/content/www/us/en/ark/products/codename/82879/kaby-lake.html), which is incorrect, instead it belongs to the Skylake(-X) family (https://ark.intel.com/content/www/us/en/ark/products/codename/37572/skylake.html).

This is what `Console.WriteLine(HostEnvironmentInfo.GetInformation());` outputs:

```
BenchmarkDotNet=v0.12.1, OS=Windows 10.0.18362.900 (1903/May2019Update/19H1)
Intel Core i9-7900X CPU 3.30GHz (Kaby Lake), 1 CPU, 20 logical and 10 physical cores
[Host] : .NET Framework 4.8 (4.8.4180.0), X64 RyuJIT

BenchmarkDotNet=v0.12.1, OS=Windows 10.0.18362.900 (1903/May2019Update/19H1)
Intel Core i9-7900X CPU 3.30GHz (Kaby Lake), 1 CPU, 20 logical and 10 physical cores
.NET Core SDK=3.1.301
[Host] : .NET Core 3.1.5 (CoreCLR 4.700.20.26901, CoreFX 4.700.20.27001), X64 RyuJIT DEBUG
```