Update releases/reference-assemblies/README.md
Update releases/reference-assemblies/README.md

Co-Authored-By: NikolaMilosavljevic <91d9de4b43449fce19e19a1f169f3d0cdf24038c@microsoft.com>
Microsoft/dotnet,BruceForstall/dotnet,Microsoft/dotnet,BruceForstall/dotnet