Minor update: test file header

Minor update:
Instead of having in the test file header:

include_once 'Pilot.php';
include_once 'Report.php';
include_once 'Runner.php';

use Exacodis\Pilot;
use Exacodis\Report;
use Exacodis\Runner;

You just have now:

include_once 'Pilot.php';

use Exacodis\{ Pilot, Report, Runner };