title: UITableViewCell clear separator
body: <p>I did like following</p>
  
  <pre><code>tableview.separatorStyle = UITableViewCellSeparatorStyleNone;
  </code></pre>
  
  <p>However, when I add new row , separator will appear like following picture.
  <img src="https://i.stack.imgur.com/LbE4j.png" alt="alt text"></p>
  
  <p>How to remove separator in UITableViewCell ?</p>