Added EditMessage

Discord.Net/API/DiscordAPI.cs

@@ -78,6 +78,11 @@ namespace Discord.API
 			var request = new APIRequests.SendMessage { Content = message, Mentions = mentions };
 			return Http.Post<APIResponses.SendMessage>(Endpoints.ChannelMessages(channelId), request, options);
 		}
+		public static Task<APIResponses.EditMessage> EditMessage(string channelId, string messageId, string message, string[] mentions, HttpOptions options)
+		{
+			var request = new APIRequests.EditMessage { Content = message, Mentions = mentions };
+			return Http.Patch<APIResponses.EditMessage>(Endpoints.ChannelMessage(channelId, messageId), request, options);
+		}
 		public static Task SendIsTyping(string channelId, HttpOptions options)
 			=> Http.Post(Endpoints.ChannelTyping(channelId), options);
 		public static Task DeleteMessage(string channelId, string msgId, HttpOptions options)

Discord.Net/API/Models/APIResponses.cs

@@ -59,6 +59,7 @@ namespace Discord.API.Models
 		public class AcceptInvite : GetInvite { }
 
 		public class SendMessage : Message { }
+		public class EditMessage : Message { }
 		public class GetMessages : Message { }
 
 		public class GetRegions

Discord.Net/API/Models/ApiRequests.cs

@@ -63,6 +63,7 @@ namespace Discord.API.Models
 			[JsonProperty(PropertyName = "mentions")]
 			public string[] Mentions;
 		}
+		public class EditMessage : SendMessage { }
 
 		public class SetMemberMute
 		{

Discord.Net/DiscordClient.cs

@@ -679,6 +679,26 @@ namespace Discord
 			}
 		}
 
+		public Task EditMessage(Message message, string text)
+			=> EditMessage(message.ChannelId, message.Id, text, new string[0]);
+		public Task EditMessage(Channel channel, string messageId, string text)
+			=> EditMessage(channel.Id, messageId, text, new string[0]);
+		public Task EditMessage(string channelId, string messageId, string text)
+			=> EditMessage(channelId, messageId, text, new string[0]);
+		public Task EditMessage(Message message, string text, string[] mentions)
+			=> EditMessage(message.ChannelId, message.Id, text, mentions);
+		public Task EditMessage(Channel channel, string messageId, string text, string[] mentions)
+			=> EditMessage(channel.Id, messageId, text, mentions);
+		public async Task EditMessage(string channelId, string messageId, string text, string[] mentions)
+		{
+			CheckReady();
+			if (text.Length > DiscordAPI.MaxMessageSize)
+				text = text.Substring(0, DiscordAPI.MaxMessageSize);
+
+			var msg = await DiscordAPI.EditMessage(channelId, messageId, text, mentions, _httpOptions);
+			_messages.Update(msg.Id, channelId, msg);
+		}
+
 		public Task DeleteMessage(Message msg)
 			=> DeleteMessage(msg.ChannelId, msg.Id);
 		public async Task DeleteMessage(string channelId, string msgId)