chore: Update the key ASCIIDOCTOR_FB2_VERSION in the README.adoc file

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Author: asciidoctor-updateclibot[bot]

README.adoc

@@ -4,7 +4,7 @@
 :ASCIIDOCTOR_PDF_VERSION: 2.3.19
 :ASCIIDOCTOR_DIAGRAM_VERSION: 2.3.1
 :ASCIIDOCTOR_EPUB3_VERSION: 2.1.3
-:ASCIIDOCTOR_FB2_VERSION: 0.7.0
+:ASCIIDOCTOR_FB2_VERSION: 0.8.0
 :ASCIIDOCTOR_MATHEMATICAL_VERSION: 0.3.5
 :ASCIIDOCTOR_REVEALJS_VERSION: 5.2.0
 :KRAMDOWN_ASCIIDOC_VERSION: 2.1.0