message: updated js example to reflect tokenset instead of accesstoken
diff: @@ -100,10 +100,10 @@ app.get('/callback', async function(req, res) {
  // Optional: read user info from the id token
  let tokenClaims = await xero.readIdTokenClaims();
  - const accessToken = await xero.readTokenSet();
  + const tokenSet = await xero.readTokenSet();
  req.session.tokenClaims = tokenClaims;
  - req.session.accessToken = accessToken;
  + req.session.tokenSet = tokenSet;
  req.session.xeroTenantId = xero.tenantIds[0];
  res.redirect('/organisation');
  })
  