Automatically toggle speaking boolean

src/Discord.Net.WebSocket/Audio/Streams/OutputStream.cs

@@ -6,6 +6,8 @@ namespace Discord.Audio.Streams
     ///<summary> Wraps an IAudioClient, sending voice data on write. </summary>
     public class OutputStream : AudioOutStream
     {
+        private bool _isSpeaking;
+
         private readonly DiscordVoiceAPIClient _client;
         public OutputStream(IAudioClient client)
             : this((client as AudioClient).ApiClient) { }
@@ -14,6 +16,14 @@ namespace Discord.Audio.Streams
             _client = client;
         }
 
+        public async Task SetSpeakingAsync(bool isSpeaking)
+        {
+            if (_isSpeaking != isSpeaking)
+            {
+                await _client.SendSetSpeaking(isSpeaking).ConfigureAwait(false);
+                _isSpeaking = isSpeaking;
+            }
+        }
         public override async Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancelToken)
         {
             cancelToken.ThrowIfCancellationRequested();