message: Update custom-issue-template.md
diff: @@ -15,4 +15,9 @@ This will help us to diagnose your issue.
  Any bugs/issues with the API are best directed to: https://developer.xero.com/community
  +Often the best palace for documentation is the integration tests in this repo. Please have a look:
  +
  +- [Integration tests](src/__integration_tests__)
  +- [Sample app](https://github.com/XeroAPI/xero-node-sample-app)
  +
  Thanks
  