Update php-cs-fixer config.

.php_cs

@@ -4,14 +4,15 @@ use Symfony\CS\Config\Config;
 use Symfony\CS\FixerInterface;
 
 $config = Config::create()
-    // use default level and extra fixers:
-    ->fixers(array('-concat_without_spaces', 'concat_with_spaces', 'strict', 'strict_param'))
-    ->setUsingCache(true)
+    // use symfony level and extra fixers:
+    ->level(Symfony\CS\FixerInterface::SYMFONY_LEVEL)
+    ->fixers(array('-concat_without_spaces', 'concat_with_spaces', 'strict'))
     ->setUsingLinter(false);
 
 $finder = $config->getFinder()
-    ->in(__DIR__)
-    ->exclude('bin');
+    ->in('bin')
+    ->in('src')
+    ->in('test');
 
 // exclude file due to error on PHP 5.3 that ignore content after __halt_compiler when using token_get_all
 if (version_compare(PHP_VERSION, '5.4', '<')) {