add a message when multiplying hours

[LeiToH]

Distinguish whether it refers to an existing or new feature..

Existing Feature

1) I am referring to the following existing feature:
bot messages
2) What do you want to add or change on it?
add a new message to the bot for when someone boosts hours
3) What would be the benefit?
Please only report this feature, when you think also other people would have a benefit of it.

you can inform the person who has a multiplier activated