private function printUpgradeIntro($io, $package)
    {
        $io->write("\n  <fg=yellow;options=bold>Seems you have "
            . ($package['direction'] === 'up' ? 'upgraded' : 'downgraded')
            . ' Yii Framework from version '
            . $package['fromPretty'] . ' to ' . $package['toPretty'] . '.</>'
        );
        $io->write("\n  <options=bold>Please check the upgrade notes for possible incompatible changes");
        $io->write('  and adjust your application code accordingly.</>');
    }