Replace atty dependency with is-terminal

[AlexTMjugador]

The rationale for this change is explained at #56. is-terminal has a MSRV of 1.48, so we need to bump our MSRV to match.

I have taken care of updating the documentation and CI workflows with the new MSRV. A new Cargo.lock.msrv file was generated by executing cargo +1.48 check on a workstation with the Rust 1.48 toolchain installed.

[epilys]

@cardoe ping/bump

[AlexTMjugador]

Now that there is some activity on this PR, I think it's worth mentioning that Rust stabilized the IsTerminal trait as a part of the standard library on version 1.70 (released on April 2023), so if bumping MSRV further is not an issue, we can use that instead.

[cardoe]

Guess we should look at what log is targeting and update in one big move.

[AlexTMjugador]

The latest log crate version, v0.4.20, targets a MSRV of 1.60, which does not guarantee the stabilization of the IsTerminal trait.

[epilys]

Could we feature-gate this and make IsTerminal opt-in? If it's possible we could satisfy everyone.

[AlexTMjugador]

Going along with log's MSRV is sensible, and the impact for newer Rust version users of having the extra is-terminal dependency is negligible.

I would suggest merging this PR as-is, without extra features (whose eventual removal would be a backwards incompatible change, by the way). Once log targets a MSRV of 1.70, we can update stderrlog-rs to match, and transparently remove the dependency on is-terminal. We also could keep waiting for log to target a MSRV of 1.70 and go directly to step 2 of this plan, I guess...

[epilys]

Thank you @cardoe, are you planning on making a crates.io release soon?

[cardoe]

Soon as I can convince CI to stop misbehaving.

[cardoe]

Should be out now.