Latest version of org.specs2:specs2-matcher-extra_sjs1_2.12
https://javadoc.io/doc/org.specs2/specs2-matcher-extra_sjs1_2.12
Current version 4.20.8
https://javadoc.io/doc/org.specs2/specs2-matcher-extra_sjs1_2.12/4.20.8
package-list path (used for javadoc generation -link option)
https://javadoc.io/doc/org.specs2/specs2-matcher-extra_sjs1_2.12/4.20.8/package-list