Fix product variant interface in command (#32)

src/Command/SynchronizeProductVariantsCommand.php

@@ -16,7 +16,7 @@
 use Doctrine\ORM\EntityManagerInterface;
 use Sulu\SyliusProducerPlugin\Producer\ProductVariantMessageProducerInterface;
 use Sylius\Component\Core\Model\ProductVariantInterface;
-use Sylius\Component\Core\Repository\ProductVariantRepositoryInterface;
+use Sylius\Component\Product\Repository\ProductVariantRepositoryInterface;
 use Symfony\Component\Console\Helper\ProgressBar;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;