Make IVoiceChannel implement INestedChannel

src/Discord.Net.Core/Entities/Channels/IVoiceChannel.cs

@@ -1,9 +1,9 @@
-using System;
+using System;
 using System.Threading.Tasks;
 
 namespace Discord
 {
-    public interface IVoiceChannel : IGuildChannel, IAudioChannel
+    public interface IVoiceChannel : IGuildChannel, IAudioChannel, INestedChannel
     {
         /// <summary> Gets the bitrate, in bits per second, clients in this voice channel are requested to use. </summary>
         int Bitrate { get; }
@@ -13,4 +13,4 @@ namespace Discord
         /// <summary> Modifies this voice channel. </summary>
         Task ModifyAsync(Action<VoiceChannelProperties> func, RequestOptions options = null);
     }
-}
+}