Utilises parallel runner

Author: raphaelstolt

.php-cs-fixer.php

@@ -2,6 +2,7 @@
 
 use PhpCsFixer\Config;
 use PhpCsFixer\Finder;
+use PhpCsFixer\Runner\Parallel\ParallelConfigFactory;
 
 $finder = Finder::create()
     ->in([__DIR__, __DIR__ . DIRECTORY_SEPARATOR . 'tests']);
@@ -22,5 +23,6 @@
 $config = new Config();
 
 return $config->setRules($rules)
+    ->setParallelConfig(ParallelConfigFactory::detect())
     ->setFinder($finder)
     ->setCacheFile($cacheDir . '/.php-cs-fixer.cache');