Latest version of org.specs2:specs2-matcher-extra_2.13.0-M3
https://javadoc.io/doc/org.specs2/specs2-matcher-extra_2.13.0-M3
Current version 4.0.4
https://javadoc.io/doc/org.specs2/specs2-matcher-extra_2.13.0-M3/4.0.4
package-list path (used for javadoc generation -link option)
https://javadoc.io/doc/org.specs2/specs2-matcher-extra_2.13.0-M3/4.0.4/package-list