Updated Drupal to 8.6. This goes with the following updates because it's possible...
[yaffs-website] / vendor / symfony / serializer / Normalizer /
drwxr-xr-x   ..
-rw-r--r-- 14670 AbstractNormalizer.php
-rw-r--r-- 13625 AbstractObjectNormalizer.php
-rw-r--r-- 2875 ArrayDenormalizer.php
-rw-r--r-- 732 ContextAwareDenormalizerInterface.php
-rw-r--r-- 715 ContextAwareNormalizerInterface.php
-rw-r--r-- 2285 CustomNormalizer.php
-rw-r--r-- 4855 DataUriNormalizer.php
-rw-r--r-- 3175 DateIntervalNormalizer.php
-rw-r--r-- 5099 DateTimeNormalizer.php
-rw-r--r-- 1611 DenormalizableInterface.php
-rw-r--r-- 613 DenormalizerAwareInterface.php
-rw-r--r-- 753 DenormalizerAwareTrait.php
-rw-r--r-- 2291 DenormalizerInterface.php
-rw-r--r-- 5185 GetSetMethodNormalizer.php
-rw-r--r-- 1883 JsonSerializableNormalizer.php
-rw-r--r-- 1456 NormalizableInterface.php
-rw-r--r-- 597 NormalizerAwareInterface.php
-rw-r--r-- 727 NormalizerAwareTrait.php
-rw-r--r-- 1774 NormalizerInterface.php
-rw-r--r-- 4162 ObjectNormalizer.php
-rw-r--r-- 1132 ObjectToPopulateTrait.php
-rw-r--r-- 5456 PropertyNormalizer.php
-rw-r--r-- 717 SerializerAwareNormalizer.php