Update condition for NuGet 4
Update condition for NuGet 4

Latest targets use a simpler condition:
https://github.com/dotnet/sdk/commit/057c7b650aae10764262fa6eb60875d5eec41c1b#diff-4a26943c6456c3afd827c7b87e69d390R117

ericstj/standard,ericstj/standard,weshaggard/standard,weshaggard/standard