Fixing pkgproj

Author: joperezr

src/System.IO.Pipelines/pkg/System.IO.Pipelines.pkgproj

@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
   <ItemGroup>
     <ProjectReference Include="..\ref\System.IO.Pipelines.csproj">
-      <SupportedFramework>net46;netcore50;netcoreapp1.0;$(UAPvNextTFM);$(AllXamarinFrameworks)</SupportedFramework>
+      <SupportedFramework>net461;netcoreapp2.0;$(AllXamarinFrameworks)</SupportedFramework>
     </ProjectReference>
     <ProjectReference Include="..\src\System.IO.Pipelines.csproj" />
   </ItemGroup>