Fixed game name not serializing

src/Discord.Net/API/Client/Common/Game.cs

@@ -4,7 +4,7 @@ namespace Discord.API.Client
 {
     public class Game
     {
-        [JsonProperty("game")]
+        [JsonProperty("name")]
         public string Name { get; set; }
         [JsonProperty("url")]
         public string Url { get; set; }