v0.6.0

Changes:

• new: added InvalidOption error interface by @sttk in #43

Docs:

• doc: corrected a mistake in doc.go by @sttk in #40

Supports:

• cicd: added go version 1.21 to ci targets, upgrade github actions by @sttk in #41

Full Changelog: v0.5.2...v0.6.0