message: updated readme for 2.5.2
diff: @@ -212,6 +212,9 @@ Feel free to send PRs on any of these issues.
  ## Release Change Log
  +* 2.5.2
  + - Merged [PR#72](https://github.com/XeroAPI/xero-node/pull/72) - Fix for Issue#71 to add support for the repeating invoices endpoint.
  + - Merged [PR#70](https://github.com/XeroAPI/xero-node/pull/70) - Fix for Issue#69 where oauth errors were not being serialised to JSON.
  * 2.5.1
  - Merged [PR#68](https://github.com/XeroAPI/xero-node/pull/68) - Fix for Issue#67 where attachments with an '&' in the name couldn't be downloaded.
  * 2.5.0
  