title: ModelForm in django, how to get maxlength attribute
body: <p>In context i have form. When I put <code>{{form}}</code> in HTML page, everything is ok.
  Something like this:</p>
  
  <pre><code>&lt;input id="id_sifraDrzave" maxlength="1024" name="sifraDrzave" type="text" /&gt;
  </code></pre>
  
  <p>How to get maxlength of field?</p>