prepare release 0.9 (#730)

src/Constants.php

@@ -29,7 +29,7 @@ class Constants
     /**
      * The current release status, either "stable" or "dev"
      */
-    public const STATUS = 'dev';
+    public const STATUS = 'stable';
     /**
      * Used in multiple views
      */

src/DependencyInjection/Configuration.php

@@ -74,7 +74,6 @@ class Configuration implements ConfigurationInterface
         $node
             ->children()
                 ->booleanNode('duration_only')
-                    ->defaultValue(false)
                     ->setDeprecated()
                 ->end()
                 ->scalarNode('mode')