Update maven-shade-plugin to version 2.3

The project fails to build with maven >= 3.1. Version of maven-shade-plugin seems to be too old for relatively new maven. I am getting following error message:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-shade-plugin:2.0:shade (default) on project japi-checker-cli: Execution default of goal org.apache.maven.plugins:maven-shade-plugin:2.0:shade failed: A required class was missing while executing org.apache.maven.plugins:maven-shade-plugin:2.0:shade: org/sonatype/aether/graph/Dependency

Update of maven-shade-plugin dependency to latest version solves the problem for me.