title: NSFetchRequest Core Data Swift 3 Backward compatibility
body: <p>I have converted my code in swift 3. I am using core data in my application. As you know, NSFetchRequest has been changed. 
  In swift 2 it was:</p>
  
  <pre><code>let request = NSFetchRequest(entityName: "UnsyncedTask")
  </code></pre>
  
  <p>In swift 3:</p>
  
  <pre><code>let request:NSFetchRequest&lt;NSFetchRequestResult&gt; = UnsyncedTask.fetchRequest()
  </code></pre>
  
  <p>My question is, It only supports ios 10. How can I make it backward ios compatible? 
  I want NSFetchRequest which supports ios 9, ios 10 with swift 3. </p>