code: public static void main(String[] args) {
          System.exit(execute(CLIParser.parse(args), System.out, System.err));
      }
docs: Will exit with
  <p>
  0 - everything ok (verified)
  1 - could not verify hash
  2 - error while parsing cli arguments
  3 - invalid bcrypt hash while verifying
  4 - general error
  
  @param args