public function arguments($args)
{
$args->add('version')->suggestions(array('5.3', '5.4', '5.5'));
$args->add('variants')->multiple()->suggestions(function () {
$variants = new VariantBuilder();
$list = $variants->getVariantNames();
sort($list);
return array_map(function ($n) {
return '+' . $n;
}, $list);
});
}