Update asciidoctor-epub3 to 1.5.0-alpha.8
properName=AsciidoctorJ EPUB3
description=AsciidoctorJ EPUB3 bundles the Asciidoctor EPUB3 RubyGem (asciidoctor-epub3) so it can be loaded into the JVM using JRuby.
-version=1.5.0-alpha.7
+version=1.5.0-alpha.8
gem_name=asciidoctor-epub3
