Merge pull request #465 from AntonyCorbett/unit_test_user_agent_fix

Add user agent string

Source/QuestPDF.Examples/LoremPicsumExample.cs

@@ -19,10 +19,12 @@ namespace QuestPDF.Examples
         {
             var url = "https://picsum.photos/300/200";
 
-            if(Greyscale)
+            if (Greyscale)
                 url += "?grayscale";
 
             using var client = new WebClient();
+            client.Headers.Add("user-agent", "QuestPDF/1.0 Unit Testing");
+            
             var response = client.DownloadData(url);
             container.Image(response);
         }
@@ -59,4 +61,4 @@ namespace QuestPDF.Examples
                 });
         }
     }
-}
+}