removeFriendFromGroup(groupID, userSteamID, callback) {
		return StdLib.Promises.timeoutCallbackPromise(10000, null, callback, true, (resolve, reject) => {
			let sid = Helpers.steamID(userSteamID);

			this._send(EMsg.AMClientRemoveFriendFromGroup, {
				groupid: groupID,
				steamiduser: sid.getSteamID64()
			}, (body) => {
				if (body.eresult != EResult.OK) {
					return reject(Helpers.eresultError(body.eresult));
				}

				let index = this.myFriendGroups[groupID].members.findIndex((element) => {
					return element.getSteamID64() === sid.getSteamID64();
				});

				if (index > -1) {
					this.myFriendGroups[groupID].members.splice(index, 1);
				}

				return resolve();
			});
		});
	}
Remove an user to friends group (tag)
@param {int} groupID - The friends group
@param {(SteamID|string)} userSteamID - The user to remove from the friends group with, as a SteamID object or a string which can parse into one
@param {function} [callback]
@return {Promise}