Correcting doc comment

Author: violuke

Diff for: src/PrintNode/PrintJob.php

@@ -13,7 +13,7 @@
  * @property string $contentType
  * @property string $content
  * @property string $source
- * @property string $options
+ * @property array $options
  * @property-read int $filesize
  * @property-read DateTime $createTimestamp
  * @property-read string $state