Print report file location in error message

When running the RAT 0.8 maven plugin from command line (no POM entry for the plugin) it will print a short error message how many violations it found, but this message could be enhanced by pointing to the report file:

C:\ws\proj>\ws\apache-maven-3.0.4\bin\mvn -s ..\empty.xml org.apache.rat:apache-rat-plugin:check
...
[INFO] — apache-rat-plugin:0.8:check (default-cli) @ proj —
...
[ERROR] Failed to execute goal org.apache.rat:apache-rat-plugin:0.8:check (default-cli) on project proj: Too many unapproved licenses: 26 -> [Help 1]

Better:

[ERROR] Failed to execute goal org.apache.rat:apache-rat-plugin:0.8:check (default-cli) on project proj: Too many unapproved licenses: 26. See target/rat.txt