2.1.245

Update asciidoctor requirement from 2.0.18 to 2.0.20 (#347)

Updates the requirements on [asciidoctor](https://github.com/asciidoctor/asciidoctor) to permit the latest version.
- [Release notes](https://github.com/asciidoctor/asciidoctor/releases)
- [Changelog](https://github.com/asciidoctor/asciidoctor/blob/main/CHANGELOG.adoc)
- [Commits](https://github.com/asciidoctor/asciidoctor/compare/v2.0.18...v2.0.20)

---
updated-dependencies:
- dependency-name: asciidoctor
  dependency-type: direct:production
...

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

2.1.244

pull request #1710 (#329)

2.1.243

B-embedding-git (#340)

2.1.242

A-git-in-other-environments diffs (#339)

2.1.241

09-git-and-other-scms diffs (#338)

2.1.240

08-customizing-git diffs (#337)

2.1.239

07-git-tools diffs (#336)

2.1.238

06-github diffs (#335)

2.1.237

04-git-server diffs (#334)

2.1.236

03 git branching diffs (#333)

* diffs in 02-git-basics

* 03-git-branching diffs