title: How to delay the ngx-bootstrap tooltip?
body: <p>Is there a way to delay the removal of the tooltip on mouse out?<br/>
  I am using it in a span:</p>
  
  <pre><code>&lt;span [tooltip]="tolTemplate"&gt;&lt;/span&gt;
  &lt;ng-template #tolTemplate&gt;
    &lt;div [innerHtml]="helpText"&gt;&lt;/div&gt;
  &lt;/ng-template&gt;
  </code></pre>