fix(error): ignore StatusCode property

Author: jaredcnance

src/JsonApiDotNetCore/Internal/Error.cs

@@ -29,6 +29,7 @@ public Error(string status, string title, string detail)
         [JsonProperty("status")]
         public string Status { get; set; }
 
+        [JsonIgnore]
         public int StatusCode { get { return int.Parse(Status); } }
     }
 }