Updates for 2.1.0 and 2.1.1 plus req lowered to 5.6

[SidneyAllen]

PHP version required lowered to 5.6 after testing successfully

Objects with a single Array of objects is updated to include interfaces with Countable, IteratorAggregate, JsonSerializable

Build from OpenAPI Spec version 2.1.0 and 2.1.1
ASSETS
AssetTypeId added

ACCOUNTING
IncludeOnline passed as path, now passed as queryParam

Add missing getPrepaymentAsPdf

UK Reporting Tax Type ENUMs added to Tax rates

PAYROLL AU
New AllowanceType class added
UTC offset added to dates before converting from date to timeInMilliseconds.

[noorburki]

there are lot of methods missing in new versions. which were available in previous version. e.g getReportStatementWithHttpInfo AND getReportBankstatement.
Why?

[SidneyAllen]

Hi @noorburki

All of our SDKs are now built off our OpenAPI specs which have been evolving as a "blueprint" that reflects the functionality of our APIs.

I'm not sure which methods you are referring to which are missing ... but we have needed to leave out the single create (which the API supports) in favor of the batch create which accomplishes both the single and batch create as they are simply an array of objects.

The bank statement report was intentionally omitted - you can read about it on this comment XeroAPI/Xero-OpenAPI#355 (comment)

hope that helps clarify things