title: Upgrade to Nebular 4 has stopped displaying font awesome icons. Setting pack is also not working
body: <p>After upgrade of Angular version 8, Nebular got updated to version 4. After the upgrade I cannot see my font awesome icons that was getting displayed earlier. </p>
  
  <p>I tried going through this document of nebular which is asking us to register font awesome as default pack. But even doing this it is not working.
  <a href="https://akveo.github.io/nebular/docs/guides/register-icon-pack#register-icon-pack" rel="nofollow noreferrer">https://akveo.github.io/nebular/docs/guides/register-icon-pack#register-icon-pack</a>.</p>
  
  <p>Could not find enough discussion on this issue. Font awesome is already included and also I have added it inside my angular.json file</p>
  
  <pre><code>constructor(private iconService: NbIconLibraries) {
      this.iconService.registerFontPack('font-aweome');
      this.iconService.setDefaultPack('font-aweome');
  }
  </code></pre>
  
  <p>Nebular should accept font-awesome icons.</p>