The Gradle build show several warnings which should be eliminated:
- 'org.asciidoctor.convert' is deprecated. When you have time please switch over to 'org.asciidoctor.jvm.convert'.
- jcenter() is no longer added by default. If you relied on this behaviour in the past, please add jcenter() to the repositories block.
- You have used 'backends'. When upgrading you will need to: Use outputOptions.setbackends