title: WTForms support for input readonly attribute?
body: <p><a href="https://groups.google.com/group/wtforms/browse_thread/thread/06755a45a13878e9/2c0dd60dc1be2032" rel="noreferrer">Here they say it's not supported out of the box.</a> </p>
  
  <p>Do you know a way to make HTML input form fields use the 'readonly' attribute with WTForms?</p>