Added updateMessage

lib/Client/InternalClient.js

@@ -184,6 +184,8 @@ var InternalClient = (function () {
 		});
 	};
 
+	// def deleteMessage
+
 	InternalClient.prototype.deleteMessage = function deleteMessage(_message) {
 		var options = arguments.length <= 1 || arguments[1] === undefined ? {} : arguments[1];
 
@@ -215,6 +217,38 @@ var InternalClient = (function () {
 		});
 	};
 
+	// def updateMessage
+
+	InternalClient.prototype.updateMessage = function updateMessage(msg, _content) {
+		var options = arguments.length <= 2 || arguments[2] === undefined ? {} : arguments[2];
+
+		var self = this;
+		return new Promise(function (resolve, reject) {
+
+			var message = self.resolver.resolveMessage(msg);
+
+			if (message) {
+
+				var content = self.resolver.resolveString(_content);
+				var mentions = self.resolver.resolveMentions(content);
+
+				request.patch(Endpoints.CHANNEL_MESSAGE(message.channel.id, message.id)).set("authorization", self.token).send({
+					content: content,
+					tts: options.tts,
+					mentions: mentions
+				}).end(function (err, res) {
+					if (err) {
+						reject(new Error(err.response.text));
+					} else {
+						resolve(message.channel.messages.update(message, new Message(res.body, message.channel, self.client)));
+					}
+				});
+			} else {
+				reject(new Error("Supplied message did not resolve to a message!"));
+			}
+		});
+	};
+
 	InternalClient.prototype.sendWS = function sendWS(object) {
 		this.websocket.send(JSON.stringify(object));
 	};