We need to migrate Nuget.ProjectModel from 4.9.0 to 5.0.0 in order to regain compatibility with OmniSharp which is currently using 5.0.0 The problem is that we are using some obsolete part of the API which has been removed in 5.0.0.

@fredpointzero I am reaching out to you on this one since you created the PR for this a while back. I'm not sure I totally understand what's going on in the NuGetUtilities class. Maybe you could have a look and see what it would take to migrate the code to 5.0.0.