Bump maven-assembly-plugin from 2.6 to 3.1.1
Bump maven-assembly-plugin from 2.6 to 3.1.1

Bumps [maven-assembly-plugin](https://github.com/apache/maven-assembly-plugin) from 2.6 to 3.1.1.
- [Release notes](https://github.com/apache/maven-assembly-plugin/releases)
- [Commits](https://github.com/apache/maven-assembly-plugin/compare/maven-assembly-plugin-2.6...maven-assembly-plugin-3.1.1)
gturri/dokuJClient,gturri/dokuJClient,gturri/dokuJClient