spin-rs no longer maintained (dependency)

[briansmith]

Quoting @bluejekyll at briansmith/ring#921:

https://rustsec.org/advisories/RUSTSEC-2019-0031

The spin dependency is no longer maintained it appears. This causes cargo audit to fail on downstream projects. I haven't had a chance to look into potential fixes.

Some (probably many) projects have a cargo audit --deny-warnings job that will now fail if they depend on lazy-static.

[GuillaumeDIDIER]

@phil-opp has developped https://crates.io/crates/spinning_top as a replacement for spin for his rust-os-dev work. Might be of use for this.

[gendx]

@phil-opp has developped https://crates.io/crates/spinning_top as a replacement for spin for his rust-os-dev work. Might be of use for this.

+1 to spinning_top. What do you think about it as a replacement?

[haraldh]

Maybe also to consider: https://github.com/4lDO2/spinning-rs

[zesterer]

FYI, spin-rs is now maintained again.

[tarcieri]

This PR should hopefully prevent spin from being reported as unmaintained:

rustsec/advisory-db#424

[KodrAus]

Now that spin-rs is back under active maintenance I think we can close thisone.

Thanks all!