Update readme

Edujugon · Apr 18, 2018 · 7e1ce8f · 7e1ce8f
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@@ -218,4 +218,10 @@ You can easily merge a new xml into the existing one. It sets it as child of the
 $mapper->mergeXML($newXml, 'desiredParentTag');
 ```
 
+#### Wrap the current xml with a custom tag
+
+```php
+$mapper->wrapWith('$tagName');
+```
+
 Enjoy :)