Fix for abstract method BotMan\BotMan\Interfaces\DriverInterface::typesAndWaits()

[filippotoso]

Just add the following code in DiscordDriver.php

    /**
     * Send a typing indicator and wait for the given amount of seconds.
     * @param IncomingMessage $matchingMessage
     * @param int $seconds
     * @param float $seconds
     * @return mixed
     */
    public function typesAndWaits(IncomingMessage $matchingMessage, float $seconds)
    {
    }