public function preUpdate(PreUpdateEventArgs $args)
{
$entity = $args->getEntity();
if ($entity instanceof Plugin && $entity->getNamespace() == 'Elcodi\\Plugin\\FacebookBundle\\ElcodiFacebookBundle') {
$facebookAccount = $entity->getConfiguration()->getFieldValue('facebook_account');
$entity->getConfiguration()->setFieldValue('facebook_account', $this->facebookUsernameCleaner->clean($facebookAccount));
}
}