Fix verbose option check

fixes: "PHP Fatal error:  Call to undefined method Composer\IO\ConsoleIO::getOption() in
magento-hackathon/magento-composer-installer/src/MagentoHackathon/Composer/Magento/Installer.php on line 572"
Merge pull request #118 from Rud5G/fix-undefined-method-getoption

Fix verbose option check
merged as cause for failing travis could get identified as independent from patch