Scrutinizer Auto-Fixes

This patch was automatically generated as part of the following inspection:
https://scrutinizer-ci.com/g/ronanguilloux/php-gpio/inspections/a97307d9-9d52-486f-9cae-1f31e7e1b833

Enabled analysis tools:
 - PHP Analyzer
 - PHP PDepend
 - PHP Similarity Analyzer
 - PHP Change Tracking Analyzer
Merge pull request #13 from ronanguilloux/scrutinizer-patch-2

Scrutinizer Auto-Fixes