Added setAvatar

lib/Client/Client.js

@@ -713,6 +713,23 @@ var Client = (function (_EventEmitter) {
 		});
 	};
 
+	//def setAvatar
+
+	Client.prototype.setAvatar = function setAvatar(avatar) {
+		var callback = arguments.length <= 1 || arguments[1] === undefined ? function (err) {} : arguments[1];
+
+		var self = this;
+		return new Promise(function (resolve, reject) {
+			self.internal.setAvatar(avatar).then(function () {
+				callback();
+				resolve();
+			})["catch"](function (err) {
+				callback(err);
+				reject(err);
+			});
+		});
+	};
+
 	//def joinVoiceChannel
 
 	Client.prototype.joinVoiceChannel = function joinVoiceChannel(channel) {