Maintain use of non-digested assets url with rails 5
<p>In upgrading to <code>rails 5</code>, some legacy asset urls needed to be converted from from an explicit form like  <code>/assets/pretty_image.png</code> to <code>image_url('pretty_image.png')</code>.  This a straight forward change and allows proper caching.  But there are emails out there with the old form url. Is there anyway I can continue to let urls like <code>/assets/pretty_image.png</code> still work in production?</p>