Change default label from "wontfix" to "stale"

[patcon]

In my understanding, wontfix has history and meaning and contextual baggage. In other contexts, it's used with intention after [thoughtful] consideration of a maintainer. I don't feel a bot should be tagging things wontfix, because it conveys more than the bot can know (or should know, unless we as maintainers of this bot are imposing an intended use).

I'm reading elsewhere that the desire is not to close issues, but to

• mark issues as less relevant and
• communicate that it needs attention to escape that mark

then can we default to something more neutral? I would suggest stale. Maintainers can filter on that (even if they're not using the "close" functionality, and get a sense of the "actual" valuable tickets are in their midst :)

[tcbyrd]

@patcon Thanks for opening this! This has also been discussed in #74 (comment)

I don't know if we've reached consensus, but I'm going to close this issue since there are other issues and PRs on this topic(#67 & #76). Feel free to add any additional thoughts to those existing conversations.