Update CS Fixer rules

Author: emodric

.php-cs-fixer.php

@@ -16,6 +16,7 @@
         'no_superfluous_phpdoc_tags' => false,
         'no_unset_on_property' => false,
         'ordered_imports' => ['imports_order' => ['class', 'function', 'const'], 'sort_algorithm' => 'alpha'],
+        'ordered_types' => ['null_adjustment' => 'always_last', 'sort_algorithm' => 'alpha'],
         'php_unit_internal_class' => false,
         'php_unit_test_case_static_method_calls' => ['call_type' => 'self'],
         'php_unit_test_class_requires_covers' => false,