PHP CS Fixer: use PHPUnit Migration ruleset

.php_cs.dist

@@ -8,9 +8,10 @@ return PhpCsFixer\Config::create()
     ->setRules(array(
         '@Symfony' => true,
         '@Symfony:risky' => true,
+        '@PHPUnit48Migration:risky' => true,
+        'php_unit_no_expectation_annotation' => false, // part of `PHPUnitXYMigration:risky` ruleset, to be enabled when PHPUnit 4.x support will be dropped, as we don't want to rewrite exceptions handling twice
         'array_syntax' => array('syntax' => 'long'),
         'protected_to_private' => false,
-        'php_unit_dedicate_assert' => array('target' => '3.5'),
     ))
     ->setRiskyAllowed(true)
     ->setFinder(