Merge pull request #431 from landy2005/final

Clean/delete parent cache dirrectory if it empty after call deleteItem()/deleteItems() for Files driver.

Author: Geolim4

src/phpFastCache/Drivers/Files/Driver.php

@@ -138,6 +138,10 @@ protected function driverDelete(CacheItemInterface $item)
         if ($item instanceof Item) {
             $file_path = $this->getFilePath($item->getKey(), true);
             if (file_exists($file_path) && @unlink($file_path)) {
+                $dir = dirname($file_path);
+                if (!(new \FilesystemIterator($dir))->valid()) {
+                    rmdir($dir);
+                }
                 return true;
             } else {
                 return false;
@@ -236,4 +240,4 @@ public function getStats()
 
         return $stat;
     }
-}
+}