aspnetcore/test/TestApps/Dependency/project.json

{
  "version": "1.0.0",
  "dependencies": {
    "NETStandard.Library": "1.5.0-*"
  },
  "frameworks": {
    "netstandard1.5": {
      "imports": [
        "dnxcore50",
        "portable-net451+win8"
      ]
    }
  }
}