Latest version of org.specs2:specs2-matcher-extra_2.12.0-M3
https://javadoc.io/doc/org.specs2/specs2-matcher-extra_2.12.0-M3
Current version 3.7.2
https://javadoc.io/doc/org.specs2/specs2-matcher-extra_2.12.0-M3/3.7.2
package-list path (used for javadoc generation -link option)
https://javadoc.io/doc/org.specs2/specs2-matcher-extra_2.12.0-M3/3.7.2/package-list