message: readme final touch
diff: # xero-node
  ![npm](https://img.shields.io/npm/v/xero-node?label=xero-node)
  -## Requirements
  -node version 10.13.0 or higher
  -
  -## SDK Documentation
  -* [version 3 - deprecated end of 2020](https://xeroapi.github.io/xero-node/v3/index.html) documentation
  -* [version 4](https://xeroapi.github.io/xero-node/v4) documentation
  -
  ## Release of SDK with oAuth 2 support
  Version 4.x of Xero NodeJS SDK only supports oAuth2 authentication and the following API sets.
  * accounting
  @@ -81,7 +74,7 @@ res.redirect(consentUrl);
  ```
  ## Step 2
  -Call the `apiCallback` function with the response url which returns a tokenSet you can save in your datastore for future API calls.
  +Call `apiCallback` function with the response url which returns a tokenSet you can save in your datastore for future calls.
  *The `tokenSet` can also be accessed from the client as `xero.readTokenSet()`.*
  @@ -162,7 +155,8 @@ await xero.updateTenants()
  await xero.accountingApi.getInvoices(xero.tenants[0].tenantId)
  ```
  -## Usage
  +## SDK Documentation
  +* [version 3 docs](https://xeroapi.github.io/xero-node/v3/index.html) documentation (*deprecated end of 2020*)
  > Full API documentation: https://xeroapi.github.io/xero-node/v4/
  ### Basics
  @@ -206,12 +200,12 @@ const invoices = {
  const createdInvoice = await xero.accountingApi.createInvoices(activeTenantId, invoices)
  ```
  -## Sample App
  +# Sample App
  For more robust examples in how to utilize our accounting api we have *(roughly)* every single endpoint mapped out with an example in our sample app - complete with showing the Xero data dependencies required for interaction with many objects ( ie. types, assoc. accounts, tax types, date formats).
  Just visit the repo https://github.com/XeroAPI/xero-node-oauth2-app configure your credentials & get started.
  -### Other Helper functions
  +## Other Helper functions
  ```js
  // xero.tenants
  xero.tenants
  