Fix delay issue

Author: redisdev

Src/FakeApi/Config.cs

@@ -12,7 +12,7 @@ internal class Config
         private CookieCollection _cookieCollection;
         private WebHeaderCollection _headerCollection;
 
-        public int DefaultDelay { get; set; }
+        public int? DefaultDelay { get; set; }
 
         public int DefaultHttpCode { get; set; }
 

Src/FakeApi/FakeHttpRequester.cs

@@ -54,7 +54,7 @@ public HttpWebResponse GetResponse(WebRequest request)
 
             var response = CreateResponseMock(config, apiResponse);
 
-            Task.Delay(apiResponse.Delay ?? config.DefaultDelay).Wait();
+            Task.Delay(apiResponse.Delay ?? config.DefaultDelay.GetValueOrDefault()).Wait();
 
             return response.Object;
         }