v1.2.1

What's Changed

• refactor grammar by @Deric-W in #8
• change build system to hatch by @Deric-W in #7
• use hatch test by @Deric-W in #10
• allow latest version of lambda-calculus dependency

New Contributors

• @dependabot[bot] made their first contribution in #3

Full Changelog: v1.2.0...v1.2.1