Promotion ID

[edwinricaurte]

I don't see the option to add the promotion_id:

lukesnowden/google-shopping-feed/src/LukeSnowden/Item.php

public function promotion_id($promotion_id)
{
$node = new Node('promotion_id');
$this->nodes['promotion_id'] = $node->value($promotion_id)->addCdata();
}

[lukesnowden]

please send over a pull request I'll pop it in 👍