bump maven-jar-plugin from 3.0.2 to 3.1.0

bump maven-jar-plugin from 3.0.2 to 3.1.0

Bumps [maven-jar-plugin](https://github.com/apache/maven-jar-plugin) from 3.0.2 to 3.1.0.
- [Release notes](https://blog.soebes.de/blog/2018/04/10/apache-maven-jar-plugin-version-3-dot-1-dot-0-released/)
- [Commits](https://github.com/apache/maven-jar-plugin/compare/maven-jar-plugin-3.0.2...maven-jar-plugin-3.1.0)

Thanks https://github.com/dependabot/dependabot-core/issues/671

Change-Id: Ia0406844764c1630f6b2631c080ce06f957358e2
Signed-off-by: Michael Vorburger <vorburger@redhat.com>