Merge branch '3.3' into 3.4

* 3.3:
  Removed useless argument $definition
  Fix comment
  [Config] Fix checking class existence freshness
  bumped Symfony version to 3.3.7
  updated VERSION for 3.3.6
  updated CHANGELOG for 3.3.6
  Bump minimal PHP version to ^5.5.9|>=7.0.8

Author: nicolas-grekas

DependencyInjection/FrameworkExtension.php

@@ -1339,7 +1339,7 @@ private function registerSecurityCsrfConfiguration(array $config, ContainerBuild
     private function registerSerializerConfiguration(array $config, ContainerBuilder $container, XmlFileLoader $loader)
     {
         if (class_exists('Symfony\Component\Serializer\Normalizer\DataUriNormalizer')) {
-            // Run after serializer.normalizer.object
+            // Run before serializer.normalizer.object
             $definition = $container->register('serializer.normalizer.data_uri', DataUriNormalizer::class);
             $definition->setPublic(false);
             $definition->addTag('serializer.normalizer', array('priority' => -920));

composer.json

@@ -16,7 +16,7 @@
         }
     ],
     "require": {
-        "php": ">=5.5.9",
+        "php": "^5.5.9|>=7.0.8",
         "ext-xml": "*",
         "symfony/cache": "~3.4|~4.0",
         "symfony/class-loader": "~3.2",