Merge pull request kodecocodes#92 from rinat-gabdullin/master

Fixing deallocation of LinkedListNode

Author: hollance

Linked List/LinkedList.swift

@@ -6,7 +6,7 @@
 public class LinkedListNode<T> {
   var value: T
   var next: LinkedListNode?
-  var previous: LinkedListNode?
+  weak var previous: LinkedListNode?
 
   public init(value: T) {
     self.value = value
@@ -159,9 +159,9 @@ extension LinkedList {
   public func reverse() {
     var node = head
     while let currentNode = node {
+        node = currentNode.next
         swap(&currentNode.next, &currentNode.previous)
         head = currentNode
-        node = currentNode.previous
     }
   }
 }