chore(rector): default configuration

Mind you, this config assumes that you are already somewhat on the
bleeding edge. If you're using a lot of older PHP syntax this
configuration might result in a massive change that will probably be
hard to review.

Author: 99linesofcode

rector.php

@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\Config\RectorConfig;
+
+return RectorConfig::configure()
+    ->withPaths([
+        __DIR__.'/src',
+        __DIR__.'/tests',
+    ])
+    ->withPreparedSets(
+        deadCode: true,
+        codeQuality: true,
+        codingStyle: true,
+        naming: true,
+        privatization: true,
+        typeDeclarations: true,
+        rectorPreset: true,
+    );