RUSTSEC-2020-0036: failure is officially deprecated/unmaintained

[github-actions[bot]]

failure is officially deprecated/unmaintained

Details
Status	unmaintained
Package	failure
Version	0.1.8
URL	https://github.com/rust-lang-nursery/failure/pull/347
Date	2020-05-02

The failure crate is officially end-of-life: it has been marked as deprecated by the former maintainer, who has announced that there will be no updates or maintenance work on it going forward.

The following are some suggested actively developed alternatives to switch to:

• anyhow
• eyre
• fehler
• snafu
• thiserror

See advisory page for additional details.

[grumbach]

Fixed with PR #66