docs: lint readme using markdownlint

Author: lotyp

app/.php-cs-fixer.php renamed to app/.php-cs-fixer.dist.php

@@ -13,6 +13,7 @@
     ->inDir(__DIR__ . '/database')
     ->inDir(__DIR__ . '/tests')
     ->addFiles([__FILE__])
+    ->useParallelConfig()
     ->getConfig()
 ;