Remove the EnsureNuGetPackageBuildImports target in the csproj because is deprecated by the NuGet team : https://forums.xamarin.com/discussion/comment/89727/#Comment_89727
Remove the EnsureNuGetPackageBuildImports target in the csproj because is deprecated by the NuGet team : https://forums.xamarin.com/discussion/comment/89727/#Comment_89727

minidfx/Rx.Contrib