fix: use no indentation for json logging

Enabling indentation for json in logs by setting default json serializer settings causes those logs to be split over multiple entries due to the new line characters. To avoid this the serializer formatting should always be set to override as "None".

source/log4net-loggly/LogglyFormatter.cs

@@ -83,6 +83,7 @@ private static string ToJsonString(JObject loggingInfo)
                 loggingInfo,
                 new JsonSerializerSettings
                 {
+                    Formatting = Formatting.None,
                     ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
                 });
         }