This PR upgrades asciidoctor-pdf to the latest and greatest version, 2.3.0.
Rouge also gets an update to the current 3.30.0.
Even though there is a new version of the Addressable gem, 2.8.1, it was not possible to upgrade that since it now requires Ruby 2.6.0, and it seems like the current version of JRuby is compatible with 2.5.0.
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Description
This PR upgrades asciidoctor-pdf to the latest and greatest version, 2.3.0. Rouge also gets an update to the current 3.30.0.
Even though there is a new version of the Addressable gem, 2.8.1, it was not possible to upgrade that since it now requires Ruby 2.6.0, and it seems like the current version of JRuby is compatible with 2.5.0.