Bump asciidoctor-diagram to 1.5.4
properName=AsciidoctorJ Diagram
description=AsciidoctorJ Diagram bundles the Asciidoctor Diagram RubyGem (asciidoctor-diagram) so it can be loaded into the JVM using JRuby.
-version=1.5.1
+version=1.5.4
gem_name=asciidoctor-diagram
