Fix Configuration::getConfigTreeBuilder()

Add forgotten ->end() on booleanNode('attachment')

Author: Михаил

DependencyInjection/Configuration.php

@@ -27,7 +27,7 @@ public function getConfigTreeBuilder()
                 ->arrayNode('features')
                     ->addDefaultsIfNotSet()
                     ->children()
-                        ->booleanNode('attachment')->defaultTrue()
+                        ->booleanNode('attachment')->defaultTrue()->end()
                     ->end()
                 ->end()
                 ->arrayNode('templates')