updating DIRECTORY.md

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github-actions 2021-02-07 18:09:07 +00:00
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* [Postorder Traversal](https://github.com/TheAlgorithms/Ruby/blob/master/data_structures/binary_trees/postorder_traversal.rb)
* [Preorder Traversal](https://github.com/TheAlgorithms/Ruby/blob/master/data_structures/binary_trees/preorder_traversal.rb)
* Linked Lists
* [Circular List](https://github.com/TheAlgorithms/Ruby/blob/master/data_structures/linked_lists/circular_list.rb)
* [Double List](https://github.com/TheAlgorithms/Ruby/blob/master/data_structures/linked_lists/double_list.rb)
* [Single List](https://github.com/TheAlgorithms/Ruby/blob/master/data_structures/linked_lists/single_list.rb)
* Queues