Release v2.1.1

What's Changed

• Update README by @shmokmt in #21
• Add LICENSE by @shmokmt in #22
• macOS 11 runner image retired by @shmokmt in #23
• Add references by @shmokmt in #24
• fix: exact match for gz files in hash_sha256_verify by @hatajoe in #25

New Contributors

• @hatajoe made their first contribution in #25

Full Changelog: v2.1.0...v2.1.1