Vermeide Deprecation (Case 193321) (#51)

...durch Nutzung von
`Symfony\Component\DependencyInjection\Extension\Extension` an Stelle
von `Symfony\Component\HttpKernel\DependencyInjection\Extension`.

Author: relthyg

DependencyInjection/WebfactoryPiwikExtension.php

@@ -4,8 +4,8 @@
 
 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 WebfactoryPiwikExtension extends Extension
 {