Added a setter to configure the name of the cachefile.

src/Config.php

@@ -22,7 +22,7 @@ final class Config extends PhpCsFixerConfig
     /**
      * @var string
      */
-    protected $cacheFile = '.php_cs.commit-cache';
+    private $cacheFile = '.php_cs.commit-cache';
 
     /**
      * Config constructor.
@@ -34,7 +34,17 @@ final class Config extends PhpCsFixerConfig
     }
 
     /**
-     * {@inheritDoc}
+     * Set cacheFile.
+     *
+     * @param string $cacheFile
+     */
+    public function setCacheFile($cacheFile)
+    {
+        $this->cacheFile = $cacheFile;
+    }
+
+    /**
+     * {@inheritdoc}
      */
     public function getRules()
     {