⬆️ Bump actions/download-artifact from 2 to 3 (#14)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 2 to 3.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v2...v3)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

🐛 fix typo

✨ Add style flag #3 (#6)

* test go 1.17

* bignum

* parse style

* draw simple

* view

* fix

* add test

Merge pull request #5 from jiro4989/chore/split_file

👍 Split files and add test codes

💚 add release ci