getLineItemID function not present

[richinnz]

In class XeroPHP\Models\Accounting\RepeatingInvoice\LineItem.php when I want to get hold of the LineItemID it always returns blank - just adding the following function resolves it - is this missing or am getting this value the wrong way?

public function getLineItemID()
{
    return $this->_data['LineItemID'];
}

[calcinai]

@richinnz It's possible that originally this was not in the documentation so was missed fro this library. Feel free to submit a PR to add it.