Added TTS support

src/Discord.Net/DiscordClient.API.cs

@@ -245,7 +245,7 @@ namespace Discord
 			=> SendMessage(channel?.Id, text, mentions);
 		/// <summary> Sends a message to the provided channel, mentioning certain users. </summary>
 		/// <remarks> While not required, it is recommended to include a mention reference in the text (see User.Mention). </remarks>
-		public async Task<Message[]> SendMessage(string channelId, string text, string[] mentions)
+		public async Task<Message[]> SendMessage(string channelId, string text, string[] mentions, bool isTextToSpeech = false)
 		{
 			CheckReady();
 			if (channelId == null) throw new ArgumentNullException(nameof(channelId));
@@ -267,7 +267,8 @@ namespace Discord
 						Content = blockText,
 						Timestamp = DateTime.UtcNow,
 						Author = new UserReference { Avatar = _currentUser.AvatarId, Discriminator = _currentUser.Discriminator, Id = _currentUser.Id, Username = _currentUser.Name },
-						ChannelId = channelId
+						ChannelId = channelId,
+						IsTextToSpeech = isTextToSpeech
 					});
 					msg.IsQueued = true;
 					msg.Nonce = nonce;
@@ -276,11 +277,11 @@ namespace Discord
 				}
 				else
 				{
-					var model = await _api.SendMessage(channelId, blockText, mentions, nonce).ConfigureAwait(false);
+					var model = await _api.SendMessage(channelId, blockText, mentions, nonce, isTextToSpeech).ConfigureAwait(false);
 					var msg = _messages.GetOrAdd(model.Id, channelId, model.Author.Id);
 					msg.Update(model);
 					RaiseMessageSent(msg);
-				}
+                }
 				await Task.Delay(1000).ConfigureAwait(false);
 			}
 			return result;

src/Discord.Net/DiscordClient.cs

@@ -791,7 +791,7 @@ namespace Discord
 						Responses.SendMessage response = null;
 						try
 						{
-							response = await _api.SendMessage(msg.ChannelId, msg.RawText, msg.MentionIds, msg.Nonce).ConfigureAwait(false);
+							response = await _api.SendMessage(msg.ChannelId, msg.RawText, msg.MentionIds, msg.Nonce, msg.IsTTS).ConfigureAwait(false);
 						}
 						catch (WebException) { break; }
 						catch (HttpException) { hasFailed = true; }

src/Discord.Net/Net/API/DiscordAPIClient.cs

@@ -125,9 +125,9 @@ namespace Discord.Net.API
 		}
 
 		//Chat
-		public Task<Responses.SendMessage> SendMessage(string channelId, string message, string[] mentions, string nonce)
+		public Task<Responses.SendMessage> SendMessage(string channelId, string message, string[] mentions, string nonce, bool isTTS)
 		{
-			var request = new Requests.SendMessage { Content = message, Mentions = mentions, Nonce = nonce };
+			var request = new Requests.SendMessage { Content = message, Mentions = mentions, Nonce = nonce, IsTTS = isTTS };
 			return _rest.Post<Responses.SendMessage>(Endpoints.ChannelMessages(channelId), request);
 		}
 		public Task<Responses.EditMessage> EditMessage(string messageId, string channelId, string message, string[] mentions)

src/Discord.Net/Net/API/Requests.cs

@@ -69,6 +69,8 @@ namespace Discord.Net.API
 			public string[] Mentions;
 			[JsonProperty(PropertyName = "nonce")]
 			public string Nonce;
+			[JsonProperty(PropertyName = "tts")]
+			public bool IsTTS;
 		}
 		public sealed class EditMessage
 		{

src/Discord.Net/Net/WebSockets/WebSocket.BuiltIn.cs

@@ -77,7 +77,7 @@ namespace Discord.Net.WebSockets
 
 							try
 							{
-                                result = await _webSocket.ReceiveAsync(buffer, cancelToken).ConfigureAwait(false);
+								result = await _webSocket.ReceiveAsync(buffer, cancelToken).ConfigureAwait(false);
 							}
 							catch (Win32Exception ex) when (ex.HResult == HR_TIMEOUT)
 							{