2.3.1

.1 patch - removed unnecessary files from the actual gem publish #89 #90 for massive reduction in gem size.

Thank you @c0va23 & @m1neral 👏

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This Release adds all the remaining API sets that the XeroAPI can interact with for the Xero product suite.

• Adds the files API
• Adds the Payroll Api AU
• Adds the Payroll Api NZ
• Adds the Payroll Api UK

Documentation updated.