minor fixes

ModpackUpdater/UpdateInfos.cs

@@ -13,6 +13,10 @@ public class UpdateInfos
 
     public override string ToString()
     {
-        return JsonConvert.SerializeObject(this);
+        return JsonConvert.SerializeObject(this, new JsonSerializerSettings
+        {
+            Formatting = Formatting.Indented,
+            DefaultValueHandling = DefaultValueHandling.IgnoreAndPopulate,
+        });
     }
 }