Dependency mbox 0.6.1 which hard requires Rust 2018

[jzaehrin]

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The release of mbox 0.6.1 now strongly requires Rust 2018 to compile by forcing severely out-dated dependency versions. Version 0.6.0 was yanked from crates.io which blocks the compilation of tss-esapi with a more recent version of Rust and a missing Cargo.lock.

tss-esapi 8.0.0 should replace mbox which is a good thing.

In the meantime, could it be possible to update mbox to 0.7.1 or force 0.6.0?

The difference between 0.6.1 and 0.7.1 is very small, not impacting the code only on the dependencies and compilation context: mbox v0.6.1 commits.

[petreeftime]

https://github.com/parallaxsecond/rust-tss-esapi/pull/520 Created a PR for this issue.

[Superhepper]

I think the preferred thing would be to update it.