Add InternalsVisibleTo for QuestPDF.Previewer in QuestPDF AssemblyInfo.

QuestPDF/Assembly.cs

@@ -1,6 +1,7 @@
 using System.Runtime.CompilerServices;
 
 [assembly: InternalsVisibleTo("DynamicProxyGenAssembly2")]
+[assembly: InternalsVisibleTo("QuestPDF.Previewer")]
 [assembly: InternalsVisibleTo("QuestPDF.UnitTests")]
 [assembly: InternalsVisibleTo("QuestPDF.Examples")]
 [assembly: InternalsVisibleTo("QuestPDF.ReportSample")]