Update the sample code

The sample code have now a line with a cell without childs

Author: Vkt0r

README.md

@@ -84,7 +84,7 @@ class AccordionViewController: AccordionTableViewController {
         let item2 = Parent(state: .collapsed, childs: ["SubItem 1", "SubItem 2"], title: "Item 2")
         let item3 = Parent(state: .collapsed, childs: ["SubItem 1", "SubItem 2", "SubItem 3"], title: "Item 3")
         let item4 = Parent(state: .collapsed, childs: ["SubItem 1", "SubItem 2"], title: "Item 4")
-        let item5 = Parent(state: .collapsed, childs: ["SubItem 1", "SubItem 2"], title: "Item 5")
+        let item5 = Parent(state: .collapsed, childs: [], title: "Item 5") // No childs for this cell
 
         dataSource = [item1, item2, item3, item4, item5]
         numberOfCellsExpanded = .several