add webpack-encore-bundle requirement

app/config/bundles.php

@@ -9,4 +9,5 @@ return [
     Symfony\Bundle\TwigBundle\TwigBundle::class => ['all' => true],
     Twig\Extra\TwigExtraBundle\TwigExtraBundle::class => ['all' => true],
     Symfony\Bundle\WebProfilerBundle\WebProfilerBundle::class => ['dev' => true, 'test' => true],
+    Symfony\WebpackEncoreBundle\WebpackEncoreBundle::class => ['all' => true],
 ];