release 0.22.0 (#191)

Bumps version to v0.21.1

Release 0.21.0 (#184)

release 0.20.0 (#173)

Bump version to v0.19 (#166)

Bump version to v0.18 (#165)

Bump sbpf version to 0.17 (#159)

release 0.16.0 (#148)

While the API remains mostly the same from 0.15.0, the breaking change
is that the syscall functions now come from trait and users may be
required to import the trait in order to have `Syscall::vm` resolve.

To be safe producing a breaking release.

Also drive-by removes a spurious `allow` that ended up sneaking in with
the refactor PR last time.

release 0.15.0 (#142)

Bumps version to v0.14.4 (#135)