Make thanks responses iterate as to prevent responses from repeating themselves often

DeukBot4/MessageHandlers/JokeHandlers.cs

@@ -75,14 +75,16 @@ namespace DeukBot4.MessageHandlers
             "It was the least I could do, I always do the least I can do!",
             "Yes, well, we'd be absolutely nowhere without me.",
             "Yeah no problem, I'm the only one who does work around here anyway",
+            "I gotchu, bb."
         };
-        private static readonly Random Rand = new Random();
+        private static int _pos = 0;
         public static async Task ThanksHandler(SocketMessage message)
         {
             var content = message.Content;
             if (ThanksMatcher.IsMatch(content))
             {
-                var response = ThanksResponses[Rand.Next(0, ThanksResponses.Length)];
+                var response = ThanksResponses[_pos];
+                _pos = (_pos + 1) % ThanksResponses.Length;
                 message.Channel.SendMessageAsync(response);
             }
         }