chore: update Fixer config (#28)

Author: keradus

Diff for: .php-cs-fixer.dist.php

@@ -0,0 +1,39 @@
+<?php
+
+/*
+ * This file is part of PHP CS Fixer / PHPUnit Constraint IsIdenticalString.
+ *
+ * (c) Dariusz Rumiński <[email protected]>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+use PhpCsFixer\Config;
+use PhpCsFixer\Finder;
+
+$header = <<<'EOF'
+This file is part of PHP CS Fixer / PHPUnit Constraint IsIdenticalString.
+
+(c) Dariusz Rumiński <[email protected]>
+
+This source file is subject to the MIT license that is bundled
+with this source code in the file LICENSE.
+EOF;
+
+$finder = Finder::create()
+    ->exclude('tests/Fixtures')
+    ->in(__DIR__)
+    ->append([__FILE__])
+;
+
+return (new Config())
+    ->setRiskyAllowed(true)
+    ->setRules([
+        '@PhpCsFixer' => true,
+        '@PhpCsFixer:risky' => true,
+        '@PHPUnit60Migration:risky' => true,
+        'header_comment' => ['header' => $header],
+    ])
+    ->setFinder($finder)
+;