Ensure Compression is referenced on .NETFramework

Author: ericstj

test/Directory.Build.props

@@ -34,6 +34,8 @@
     <PackageReference Include="Microsoft.DotNet.XUnitExtensions" Version="$(MicrosoftDotNetXUnitExtensionsVersion)" />
     <PackageReference Include="coverlet.collector" Version="$(CoverletCollectorVersion)" />
     <PackageReference Include="Newtonsoft.Json" Version="$(NewtonsoftJsonVersion)" />
+
+    <Reference Condition="'$(TargetFrameworkIdentifier)' == '.NETFramework'" Include="System.IO.Compression" />
   </ItemGroup>
 
   <ItemGroup>