Merge pull request #319 from eltharin/prevent_deprecation

change parent classe for clear deprecation

src/DependencyInjection/LiipTestFixturesExtension.php

@@ -15,8 +15,8 @@
 
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Extension\Extension;
 use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
-use Symfony\Component\HttpKernel\DependencyInjection\Extension;
 
 class LiipTestFixturesExtension extends Extension
 {