Feature request: multiple configurations

[niosus]

Thanks for this awesome bot!
I would really love to have the bot close issues for multiple labels with the message and the time until closure depending on the label.

For example, with label awaiting-feedback the issue would be closed in 7 days with a message that asks for more info, while an issue with cannot-reproduce would close in 30 days with the message that the issue is outdated or alike.