As announced in #228, this commit migrates all advisories to the new V2
format, which splits version information into a separate section, and
now has a structure which corresponds to the internal code structure of
the `rustsec` crate.
This is a breaking change for users of `cargo-audit` < 0.9, and anyone
who has written a 3rd party advisory format parser.
No releases since May 2016, no commits since September 2016, with
62 open issues and 37 open PRs.
Author is unresponsive:
https://github.com/DaGenix/rust-crypto/issues/440
Advisory includes a large list of maintained "successor" crates:
`rust-crypto` was a kitchen sink of functionality, so the advisory
contains a list of potential successor crates each with an
algorithm-by-algorithm breakdown of what they support.
