Lowered bitrate max to 128kbps

src/Discord.Net.Audio/AudioServiceConfig.cs

@@ -33,7 +33,7 @@ namespace Discord.Audio
 		public int BufferLength { get { return _bufferLength; } set { SetValue(ref _bufferLength, value); } }
 		private int _bufferLength = 1000;
 
-		/// <summary> Gets or sets the bitrate used (in kbit/s, between 1 and 512 inclusively) for outgoing voice packets. A null value will use default Opus settings. </summary>
+		/// <summary> Gets or sets the bitrate used (in kbit/s, between 1 and 128 inclusively) for outgoing voice packets. A null value will use default Opus settings. </summary>
 		public int? Bitrate { get { return _bitrate; } set { SetValue(ref _bitrate, value); } }
 		private int? _bitrate = null;
         /// <summary> Gets or sets the number of channels (1 or 2) used in both input provided to IAudioClient and output send to Discord. Defaults to 2 (stereo). </summary>