Fix obsolete

src/DotNetCore.CAP.Dashboard/JsonDispatcher.cs

@@ -38,7 +38,7 @@ namespace DotNetCore.CAP.Dashboard
                     {
                         new StringEnumConverter
                         { 
-                            CamelCaseText= true
+                            NamingStrategy = new CamelCaseNamingStrategy()
                         }
                     }
                 };

src/DotNetCore.CAP.Dashboard/JsonStats.cs

@@ -34,7 +34,7 @@ namespace DotNetCore.CAP.Dashboard
                 {
                     new StringEnumConverter
                     {
-                        CamelCaseText = true
+                        NamingStrategy = new CamelCaseNamingStrategy()
                     }
                 }
             };