Allow passing of saveXML options (#235)

* Allow passing of saveXML options * Feedback

Author: VincentBean

src/ArrayToXml.php

@@ -90,11 +90,11 @@ public static function convert(
  return $converter->toXml();
  }
 
- public function toXml(): string
+ public function toXml($options = 0): string
  {
  return $this->addXmlDeclaration
- ? $this->document->saveXML()
- : $this->document->saveXML($this->document->documentElement);
+ ? $this->document->saveXML(options: $options)
+ : $this->document->saveXML($this->document->documentElement, $options);
  }
 
  public function toDom(): DOMDocument