Scrutinizer Auto-Fixes

@prisis requested this pull request.

This patch was automatically generated as part of the following inspection:
https://scrutinizer-ci.com/g/prisis/Slim/inspections/43e447c4-6e94-4187-8850-96a366dfd0e0

Enabled analysis tools:
 - PHP Analyzer
 - PHP PDepend
 - PHP Similarity Analyzer
 - PHP Change Tracking Analyzer