Swift 3 warning for dispatch async
<p>I have this code:</p>

<pre><code>DispatchQueue.global(priority: DispatchQueue.GlobalQueuePriority.default).async {
                let url = URL(string: itemImageURL )
                let data = try? Data(contentsOf: url!)
                if data != nil {
                    DispatchQueue.main.async{
                        cell.advImage!.image = UIImage(data: data!)
                    }
                }
            }
</code></pre>

<p>I get this warning in Swift 3:</p>

<blockquote>
  <p>'default' was deprecated in iOS 8.0: Use qos attributes instead</p>
</blockquote>

<p>on the first line.</p>

<p>Haven't found yet a solution. Has anybody?</p>