message: updated readme for 2.5.3
diff: @@ -213,6 +213,9 @@ Feel free to send PRs on any of these issues.
  ## Release Change Log
  +* 2.5.3
  + - Merged [PR#76](https://github.com/XeroAPI/xero-node/pull/76) - Updated the docs to add repeating invoices (missed from PR#72).
  + - Merged [PR#75](https://github.com/XeroAPI/xero-node/pull/75) - Added documentation about invoice/contact filters.
  * 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.
  