updating DIRECTORY.md

Author: github-actions

DIRECTORY.md

@@ -108,6 +108,7 @@
   * tests
     * [CoinChange](https://github.com/TheAlgorithms/Javascript/blob/master/Dynamic-Programming/tests/CoinChange.test.js)
     * [LongestPalindromicSubsequence](https://github.com/TheAlgorithms/Javascript/blob/master/Dynamic-Programming/tests/LongestPalindromicSubsequence.test.js)
+    * [LongestValidParentheses](https://github.com/TheAlgorithms/Javascript/blob/master/Dynamic-Programming/tests/LongestValidParentheses.test.js)
   * [TrappingRainWater](https://github.com/TheAlgorithms/Javascript/blob/master/Dynamic-Programming/TrappingRainWater.js)
   * [ZeroOneKnapsack](https://github.com/TheAlgorithms/Javascript/blob/master/Dynamic-Programming/ZeroOneKnapsack.js)