title: cannot deploy - ERROR: You cannot have more than 500 Application Versions
body: <p>I get the following error when deploying to EB:</p>
  
  <blockquote>
    <p>ERROR: You cannot have more than 500 Application Versions. Either
    remove some Application Versions or request a limit increase.</p>
  </blockquote>
  
  <p>I went manually and deleted some versions.
  I don't want deploys to fail because of this limit. 
  Is there a way in Elastic Beanstalk to auto-evict unused versions? </p>