Fixes dashboard style conversion

src/DotNetCore.CAP.Dashboard/JsonSerializeOptions.cs

@@ -1,4 +1,5 @@
 using System.Text.Json;
+using System.Text.Json.Serialization;
 
 namespace DotNetCore.CAP.Dashboard
 {
@@ -6,7 +7,11 @@ namespace DotNetCore.CAP.Dashboard
     {
         public static JsonSerializerOptions Default = new JsonSerializerOptions
         {
-            PropertyNamingPolicy = JsonNamingPolicy.CamelCase
+            PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
+            Converters =
+            {
+                new JsonStringEnumConverter(JsonNamingPolicy.CamelCase)
+            }
         };
     }
 }