Fix typo

nibra · nibra · commit 26253bf094ae · 2021-03-26T14:47:27.000+01:00
diff --git a/README.md b/README.md
@@ -367,7 +367,7 @@ array(3) {
 
 ### flatten
 
-``` php
+```php
 use Joomla\Utilities\ArrayHelper;
 
 $array = array(
