[Serializer] Fatal error: Class 'Symfony\Component\PropertyAccess\PropertyAccess' not found

Using `symfony/serializer: "~3.1"` in my project and got that error when using the ObjectNormalizer. Seems that serializer component is [dependent on PropertyAccess](https://github.com/symfony/serializer/blob/3.1/Normalizer/ObjectNormalizer.php#L15) but there's [no requirement](https://github.com/symfony/serializer/blob/3.1/composer.json#L18) in composer.