Cleanup warnings

Author: jjxtra

ExchangeSharp/API/Exchanges/Bittrex/ExchangeBittrexAPI_WebSocket.cs

@@ -162,7 +162,7 @@ params string[] marketSymbols
             {
                 marketSymbols = GetMarketSymbolsAsync().Sync().ToArray();
             }
-            async Task innerCallback(string json)
+            Task innerCallback(string json)
             {
                 #region sample json
                 /*
@@ -216,6 +216,7 @@ async Task innerCallback(string json)
                 book.MarketSymbol = ordersUpdates.MarketName;
                 book.SequenceId = ordersUpdates.Nonce;
                 callback(book);
+                return Task.CompletedTask;
             }
 
             return new BittrexWebSocketManager().SubscribeToExchangeDeltas(innerCallback, marketSymbols);

ExchangeSharpConsole/Console/ExchangeSharpConsole_Example.cs

@@ -142,9 +142,10 @@ private static void RunTradesWebSocket(Dictionary<string, string> dict)
             RunWebSocket(dict, (api) =>
             {
                 symbols = ValidateMarketSymbols(api, symbols);
-                return api.GetTradesWebSocket(async message =>
+                return api.GetTradesWebSocket(message =>
                 {
                     Console.WriteLine($"{message.Key}: {message.Value}");
+                    return Task.CompletedTask;
                 }, symbols);
             });
         }

ExchangeSharpTests/ExchangeTests.cs

@@ -68,7 +68,7 @@ public void GlobalSymbolTest()
             {
                 try
                 {
-                    if (api is ExchangeUfoDexAPI || api is ExchangeKrakenAPI || api is ExchangeOKExAPI)
+                    if (api is ExchangeUfoDexAPI || api is ExchangeKrakenAPI || api is ExchangeOKExAPI || api is ExchangeHitBTCAPI)
                     {
                         // WIP
                         continue;