title: Can I add a special character ñ in my domain on heroku
body: <p>I'm trying to add my domain to my heroku app.</p>
  
  <p>I run:</p>
  
  <pre><code>heroku domains:add www.urlwithanñ.com
  </code></pre>
  
  <p>and I get the message: "Domain is invalid"</p>
  
  <p>¿Is this because of the ñ ?</p>
  
  <p>I have successfully registered the domain so it can't be invalid.</p>