title: ngx-owl-carousel is not working in angular 6
body: <p>I have a simple angular 6 app and I have a added a <code>simple ngx-owl-carousel</code> , I have followed all steps as per instruction  here is the link : <a href="https://www.npmjs.com/package/ngx-owl-carousel" rel="nofollow noreferrer">https://www.npmjs.com/package/ngx-owl-carousel</a>.</p>
  
  <p>Here is my html :</p>
  
  <pre><code>&lt;owl-carousel
  [options]="{items: 4, dots: false, navigation: false}"
  [items]="images"
  [carouselClasses]="['owl-theme', 'row', 'sliding']"&gt;
  &lt;div class="item" *ngFor="let image of images;let i = index"&gt;
      &lt;div class="thumbnail-image"&gt;&lt;/div&gt;
    &lt;/div&gt;
  &lt;/owl-carousel&gt;
  </code></pre>
  
  <p>here is component.ts array of immages</p>
  
  <pre><code>export class WhatwedoComponent {
    images = [
      '/assets/images/ico_1_dark.png',
      '/assets/images/ico_2_dark.png',
      '/assets/images/ico_3_dark.png',
      '/assets/images/ico_4_dark.png',
    ];
  </code></pre>
  
  <p>}</p>
  
  <p>Unfortunately the carousel is not displayed at all in my app; in console browser no errors. </p>
  
  <p>what is wrong with my codes ?, any help will be apreciated .</p>