updating DIRECTORY.md

Author: cclauss

DIRECTORY.md

@@ -275,15 +275,15 @@
     * [Singly Linked List](data_structures/linked_list/singly_linked_list.py)
     * [Skip List](data_structures/linked_list/skip_list.py)
     * [Swap Nodes](data_structures/linked_list/swap_nodes.py)
-  * Queue
-    * [Circular Queue](data_structures/queue/circular_queue.py)
-    * [Circular Queue Linked List](data_structures/queue/circular_queue_linked_list.py)
-    * [Double Ended Queue](data_structures/queue/double_ended_queue.py)
-    * [Linked Queue](data_structures/queue/linked_queue.py)
-    * [Priority Queue Using List](data_structures/queue/priority_queue_using_list.py)
-    * [Queue By List](data_structures/queue/queue_by_list.py)
-    * [Queue By Two Stacks](data_structures/queue/queue_by_two_stacks.py)
-    * [Queue On Pseudo Stack](data_structures/queue/queue_on_pseudo_stack.py)
+  * Queues
+    * [Circular Queue](data_structures/queues/circular_queue.py)
+    * [Circular Queue Linked List](data_structures/queues/circular_queue_linked_list.py)
+    * [Double Ended Queue](data_structures/queues/double_ended_queue.py)
+    * [Linked Queue](data_structures/queues/linked_queue.py)
+    * [Priority Queue Using List](data_structures/queues/priority_queue_using_list.py)
+    * [Queue By List](data_structures/queues/queue_by_list.py)
+    * [Queue By Two Stacks](data_structures/queues/queue_by_two_stacks.py)
+    * [Queue On Pseudo Stack](data_structures/queues/queue_on_pseudo_stack.py)
   * Stacks
     * [Balanced Parentheses](data_structures/stacks/balanced_parentheses.py)
     * [Dijkstras Two Stack Algorithm](data_structures/stacks/dijkstras_two_stack_algorithm.py)