Add !specifictakerate command

[EchoFrost]

This should print a tuple of two integers whose values are randomly generated from the range -999999999 to 999999999 followed by the message 'Use !takerate for a more general take'.

🔢

    elif message.content.startswith('!specifictakerate'):
        msg = '(' + str(r.randint(-999999999,999999999)) + ', ' + str(r.randint(-999999999,999999999)) + ') Use !takerate for a more general take'.format(message)
        yield from channel.send(msg)