inviteToChat(chatID, userID) {
		userID = Helpers.steamID(userID);

		this._send(EMsg.ClientChatInvite, {
			steam_id_invited: userID.getSteamID64(),
			steam_id_chat: toChatID(chatID).getSteamID64()
		});
	}
Invites a user to a chat room.
@param {(SteamID|string)} chatID - The SteamID of the chat room to invite the user to (as a SteamID object or a string which can parse into one)
@param {(SteamID|string)} userID - The SteamID of the user to invite (as a SteamID object or a string which can parse into one)
@deprecated This uses the old-style chat rooms, if you want new chat instead use this.chat