v0.2.1

🎉 Hello world, I'm a new release for better work!

1. Fix removing .git folder failed (#10) .
2. Fix incompatible gems cache caused corruption (#12) .
3. Add libvips-dev library dependency (#13).
4. Fix caching bundle gems not working (#14).
5. Remove unused output.
6. Update actions/cache configuration.
7. Bump kramdown from 2.3.0 to 2.3.1 (#16).

Welcome to update to this version.