Make AbstractPhpFileCacheWarmer public

Author: ossinkine

src/Symfony/Bundle/FrameworkBundle/CacheWarmer/AbstractPhpFileCacheWarmer.php

@@ -19,9 +19,6 @@
 use Symfony\Component\Config\Resource\ClassExistenceResource;
 use Symfony\Component\HttpKernel\CacheWarmer\CacheWarmerInterface;
 
-/**
- * @internal
- */
 abstract class AbstractPhpFileCacheWarmer implements CacheWarmerInterface
 {
     private $phpArrayFile;