public function load(ObjectManager $manager)
 {
     $nbr = 20;
     for ($i = 1; $i < $nbr; $i++) {
         $article = new Article();
         $article->setAuteur("Greg Berger");
         $article->setTitre("Article " . $i);
         $article->setContenu($i . " - Lorem ipsum etc.");
         $image = new ISL\BlogBundle\Entity\Image();
         $image->setUrl('https://placekitten.com/g/200/300');
         $image->setAlt('placeholder');
         $article->setImage($image);
         $article->addCategorie($this->getReference('cat-' . rand(0, 3)));
         $article->addCategorie($this->getReference('cat-' . rand(0, 3)));
         $manager->persist($article);
     }
     $manager->flush();
 }