Add typeName to exception message which leads to ArgumentException in…

… CodeArtifact ctor. (#1358)

src/NJsonSchema.CodeGeneration/CodeArtifact.cs

@@ -58,7 +58,7 @@ public CodeArtifact(string typeName, string baseTypeName, CodeArtifactType type,
         {
             if (typeName == baseTypeName)
             {
-                throw new ArgumentException("The baseTypeName cannot equal typeName.", nameof(typeName));
+                throw new ArgumentException($"The baseTypeName '{baseTypeName}' cannot equal typeName.", nameof(typeName));
             }
 
             TypeName = typeName;