The StyleCop package version 4.7.10 seems to be the last one that contained StyleCop.CSharp.Rules.dll.
On the AspNetWebStack project we use that package along with Nuget package restore to "install" StyleCop into our build. Since the newer versions don't have the C# Rules that means that effectively running StyleCop does nothing (and it's not obvious,
since no error/warning seems to be provided).
Would you consider readding that Rules binary to the package or perhaps creating a new package that contains them?