Update PHP-CS-Fixer configuration

Author: sebastianbergmann

.php-cs-fixer.dist.php

@@ -11,11 +11,9 @@
 $finder = PhpCsFixer\Finder::create()
     ->files()
     ->in(__DIR__ . '/src')
-    ->in(__DIR__ . '/tests/basic')
+    ->in(__DIR__ . '/tests/_files')
     ->in(__DIR__ . '/tests/end-to-end')
-    ->in(__DIR__ . '/tests/fail')
     ->in(__DIR__ . '/tests/unit')
-    ->in(__DIR__ . '/tests/_files')
     ->notName('*.phpt')
     ->notName('ClassWithAllPossibleReturnTypes.php')
     ->notName('ClassWithUnionReturnTypes.php')