Add 'Tracking' as a plural of 'TrackingCategory' #149
Merged
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This feels a bit uncomfortable, but effectively; the Xero API is inconsistent about using 'TrackingCategories' as the key for elements where it expects the sub-elements to be 'TrackingCategory'. Specifically, for LineItems, it uses the term 'Tracking' instead, as per https://developer.xero.com/documentation/api/invoices/
So, this adds 'Tracking' as a "plural" version of "TrackingCategory", to allow inserting line items with tracked options enabled. Without this, creating invoices fails with
PostDataInvalidException: Object reference not set to an instance of an object. []