Make the bot less spammy

[mbasaglia]

This bot keeps spamming the same issues. perhaps it should mark issues as stale only after a contributor to the project has left a comment, because otherwise it marks as stale issues for which no action has been taken and no additional information has been requested by the maintainer.

Here's an example
telegramdesktop/tdesktop#7691

It's rather annoying to see spam messages from the bot and risk getting the issue closed with no resolution if I don't take the time to add a comment.

[welcome]

Thanks for opening this issue. A contributor should be by to give feedback soon. In the meantime, please check out the contributing guidelines and explore other ways you can get involved.

[gr2m]

Add a pinned label. This is not a probot issue, but an issue with the stale app, so I'm going to move the issue over there