title: Ionic-3 ion-input maxlength attribute not working
body: <p>I have tried to add <code>ion-input</code> for  <code>maxlength</code> , <code>max</code> attribute but it's not working as per expectation.</p>
  
  <pre><code>&lt;ion-input type="number" placeholder="*" maxlength="1"&gt;&lt;/ion-input&gt;
  
  &lt;ion-input type="number" placeholder="*" max="1"&gt;&lt;/ion-input&gt;
  </code></pre>
  
  <p>Anyone knows the solution for the same?</p>
  
  <p>Thanks </p>