Scrutinizer Auto-Fixes

This patch was automatically generated as part of the following inspection:
https://scrutinizer-ci.com/g/schmittjoh/serializer/inspections/0cda3d1a-f829-4c4a-8456-0b41e6fda549

Enabled analysis tools:
 - PHP Analyzer
 - PHP Mess Detector
 - PHP Copy/Paste Detector
 - PHP PDepend