updating DIRECTORY.md

Author: github-actions

DIRECTORY.md

@@ -107,6 +107,7 @@
   * [SudokuSolver](https://github.com/TheAlgorithms/Javascript/blob/master/Dynamic-Programming/SudokuSolver.js)
   * 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)
   * [TrappingRainWater](https://github.com/TheAlgorithms/Javascript/blob/master/Dynamic-Programming/TrappingRainWater.js)
   * [ZeroOneKnapsack](https://github.com/TheAlgorithms/Javascript/blob/master/Dynamic-Programming/ZeroOneKnapsack.js)