Bump asciidoctorj from 1.6.1 to 2.1.0
Bump asciidoctorj from 1.6.1 to 2.1.0

Bumps [asciidoctorj](https://github.com/asciidoctor/asciidoctorj) from 1.6.1 to 2.1.0.
- [Release notes](https://github.com/asciidoctor/asciidoctorj/releases)
- [Changelog](https://github.com/asciidoctor/asciidoctorj/blob/master/CHANGELOG.adoc)
- [Commits](https://github.com/asciidoctor/asciidoctorj/compare/v1.6.1...v2.1.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
jooby-project/jooby,jooby-project/jooby,jooby-project/jooby,jooby-project/jooby,jooby-project/jooby