Four places told people to write `soulseek-rs-lib = "8"` (RELEASE.md said "6"),
and every one of them had been left behind by ten majors or more. The failure is
silent rather than loud: 6.x and 8.0.0 are both real published versions, so cargo
resolves the snippet happily and hands over a library from August instead of
refusing it, and one of the four is soulseek-rs-lib's own README, which is the
page crates.io renders.
`cargo add` writes whatever version is current at the time it runs, so there is
no longer a number in the docs to go stale. The manifest pin in
soulseek-rs/Cargo.toml stays as it is — release-plz owns that one and keeps it
in step with the release.