v0.4.0

Features

• add the selfupdate package and letsgo update (1789159)
• publish a reproducible CycloneDX SBOM (374fe8d)
• add letsgo yank (2643705)

Fixes

• key the build cache on the Go version (f1f08e1)

Refactoring

• satisfy golangci-lint (de6e3fe)

Documentation

• cut the readme back to usage and move detail to the wiki (#1)

Other changes

• Create dependabot.yml (51d24c4)

2 maintenance commits not shown.