Add InternalsVisibleTo for QuestPDF.ConformanceTests

Source/QuestPDF/QuestPDF.csproj

@@ -39,6 +39,7 @@
         <InternalsVisibleTo Include="QuestPDF.UnitTests" />
         <InternalsVisibleTo Include="QuestPDF.LayoutTests" />
         <InternalsVisibleTo Include="QuestPDF.VisualTests" />
+        <InternalsVisibleTo Include="QuestPDF.ConformanceTests" />
     </ItemGroup>
 
     <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">