title: CloudFormation doesn't deploy to API gateway stages on update
body: <p>When I run CloudFormation <code>deploy</code> using a template with API Gateway resources, the first time I run it, it creates and deploys to stages. The subsequent times I run it, it updates the resources but doesn't deploy to stages.</p>
  
  <p>Is that behaviour as intended?  If yes, how'd I get it to deploy to stages whenever it updates?</p>
  
  <p>(Terraform mentions a similar issue: <a href="https://github.com/hashicorp/terraform/issues/6613" rel="noreferrer">https://github.com/hashicorp/terraform/issues/6613</a>)</p>