Bump Asciidoctor-Epub3 version to 2.1.0

[asciidoctor-updateclibot[bot]]

Bump Asciidoctor-Epub3 version

Update the key ASCIIDOCTOR_EPUB3_VERSION in the test harness

1 file(s) updated with "ASCIIDOCTOR_EPUB3_VERSION=2.1.0": * tests/asciidoctor.bats

2.1.0

Release published on the 2024-02-04 13:31:06 +0000 UTC at the url https://github.com/asciidoctor/asciidoctor-epub3/releases/tag/v2.1.0

## Summary

Amazon was putting up more and more roadblocks discouraging users from using MOBI and KF8 last years. The time has come. Starting from this release, Asciidoctor EPUB3 drops support for those formats and now will fully concentrate development efforts on providing the best EPUB3 experience.

## Distribution

- [RubyGem (asciidoctor-epub3)](https://rubygems.org/gems/asciidoctor-epub3)

## Changelog

* drop MOBI support (#458)
* add support for blocks in callouts (#463)

## Release meta

Released on: 2024-02-04
Released by: @slonopotamus

Logs: [resolved issues](https://github.com/asciidoctor/asciidoctor-epub3/issues?q=milestone%3Av2.1.0) | [full diff](https://github.com/asciidoctor/asciidoctor-epub3/compare/v2.0.1...v2.1.0)

Update the key ASCIIDOCTOR_EPUB3_VERSION in the README.adoc file

1 file(s) updated with ":ASCIIDOCTOR_EPUB3_VERSION: 2.1.0": * README.adoc

2.1.0

Release published on the 2024-02-04 13:31:06 +0000 UTC at the url https://github.com/asciidoctor/asciidoctor-epub3/releases/tag/v2.1.0

## Summary

Amazon was putting up more and more roadblocks discouraging users from using MOBI and KF8 last years. The time has come. Starting from this release, Asciidoctor EPUB3 drops support for those formats and now will fully concentrate development efforts on providing the best EPUB3 experience.

## Distribution

- [RubyGem (asciidoctor-epub3)](https://rubygems.org/gems/asciidoctor-epub3)

## Changelog

* drop MOBI support (#458)
* add support for blocks in callouts (#463)

## Release meta

Released on: 2024-02-04
Released by: @slonopotamus

Logs: [resolved issues](https://github.com/asciidoctor/asciidoctor-epub3/issues?q=milestone%3Av2.1.0) | [full diff](https://github.com/asciidoctor/asciidoctor-epub3/compare/v2.0.1...v2.1.0)

Update the value of ARG asciidoctor_epub3_version in the Dockerfile

changed lines [89] of file "/tmp/updatecli/github/asciidoctor/docker-asciidoctor/Dockerfile"

2.1.0

Release published on the 2024-02-04 13:31:06 +0000 UTC at the url https://github.com/asciidoctor/asciidoctor-epub3/releases/tag/v2.1.0

## Summary

Amazon was putting up more and more roadblocks discouraging users from using MOBI and KF8 last years. The time has come. Starting from this release, Asciidoctor EPUB3 drops support for those formats and now will fully concentrate development efforts on providing the best EPUB3 experience.

## Distribution

- [RubyGem (asciidoctor-epub3)](https://rubygems.org/gems/asciidoctor-epub3)

## Changelog

* drop MOBI support (#458)
* add support for blocks in callouts (#463)

## Release meta

Released on: 2024-02-04
Released by: @slonopotamus

Logs: [resolved issues](https://github.com/asciidoctor/asciidoctor-epub3/issues?q=milestone%3Av2.1.0) | [full diff](https://github.com/asciidoctor/asciidoctor-epub3/compare/v2.0.1...v2.1.0)

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