private static function clearComposerLockFile($io, $projectRoot)
{
$io->write("<info>Removing composer.lock from .gitignore</info>");
$ignoreFile = "{$projectRoot}/.gitignore";
$content = self::removeLinesContainingStrings(['composer.lock'], file_get_contents($ignoreFile));
file_put_contents($ignoreFile, $content);
}