title: UITableView - remove separator for "inactive" rows
body: <p>I have screen similar to:
  <img src="https://i.stack.imgur.com/GjOIQ.png" alt="enter image description here"></p>
  
  <p>I want to remove separator below last "active" cell in tableView (in this case everything below "Kompozytorzy". How can i remove this separators?</p>
  
  <p>I try to customize separators in <code>cellForRow:AtIndexPath:</code>, but everytime i change it this effect whole tableView.</p>