title: vue-bootstrap-datetimepicker input typing permission block without disabled & readonly
body: <p>I'm using <code>vue-bootstrap-datetimepicker</code> in my project. It's works fine.</p>
  <p>But I faced an error in this picker input typing time. So I need to block that input typing.</p>
  <p>If I use <code>disabled</code> &amp; <code>readonly</code> the focus is not working. So the picker popup will not show. (picker functionalities do not trigger)</p>
  <p>Is there a better solution?</p>