Update asciidoctor-fb2 requirement from 0.7.0 to 0.8.0 (#71)
Updates the requirements on [asciidoctor-fb2](https://github.com/asciidoctor/asciidoctor-fb2) to permit the latest version.
- [Release notes](https://github.com/asciidoctor/asciidoctor-fb2/releases)
- [Changelog](https://github.com/asciidoctor/asciidoctor-fb2/blob/main/CHANGELOG.adoc)
- [Commits](https://github.com/asciidoctor/asciidoctor-fb2/compare/v0.7.0...v0.8.0)
---
updated-dependencies:
- dependency-name: asciidoctor-fb2
dependency-type: direct:production
...
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