remove json stuff

BlizzSharpClient.cs

         private readonly Dictionary<long, Item> _itemLookup;
         private string _key;
         private HttpClient _http;
-        private JsonSerializer _serializer;
         private long _latestTimeStamp;
         public AuctionResponse CurrentAuctionResponse {get;set;}
         public AuctionResponse PreviousAuctionResponse {get;set;}
         public BlizzSharpClient(string key)
         {
             _itemLookup = new Dictionary<long, Item>();
-            _serializer = new JsonSerializer();
             _http = new HttpClient();
             _http.BaseAddress = new Uri("https://eu.api.battle.net/wow/");
             _http.DefaultRequestHeaders.Accept.Clear();