Clarify maintenance

[ThatsNoMoon]

It seems like quick_error has fallen behind on modern rust idioms. Are you planning on updating this crate further? Maybe it would be prudent to suggest a more modern and maintained alternative like thiserror in the readme if not. Otherwise, issues like #42 and #48 are blockers for some users, myself included.

[tailhook]

Well, the point why people still use quick_error is for avoiding procedural macros (perhaps because procedural macros makes much longer to compile on cold cache), so #42 doesn't make sense. #48 probably can be fixed (I think it was a problem at the moment the issue was created as there was no vis qualifier). I'm not sure if fixing #48 requires bumping minimal supported rust version, though.

[ThatsNoMoon]

That's reasonable.

I'm not sure if fixing #48 requires bumping minimal supported rust version, though.

If quick-error has a documented MSRV, it's not very discoverable. vis was added over 2 years ago, in Rust 1.30. It's unclear to me if that is more or less than what you want to support.

[tailhook]

If quick-error has a documented MSRV, it's not very discoverable. vis was added over 2 years ago, in Rust 1.30. It's unclear to me if that is more or less than what you want to support.

It's definitely >= 1.31 (first edition 2018) now. But yes, has to be more discoverable.