updating DIRECTORY.md

Author: github-actions

DIRECTORY.md

@@ -58,6 +58,7 @@
  * [LevenshteinDistance](https://github.com/TheAlgorithms/Javascript/blob/master/Dynamic-Programming/LevenshteinDistance.js)
  * [LongestCommonSubsequence](https://github.com/TheAlgorithms/Javascript/blob/master/Dynamic-Programming/LongestCommonSubsequence.js)
  * [LongestIncreasingSubsequence](https://github.com/TheAlgorithms/Javascript/blob/master/Dynamic-Programming/LongestIncreasingSubsequence.js)
+ * [LongestPalindromicSubsequence](https://github.com/TheAlgorithms/Javascript/blob/master/Dynamic-Programming/LongestPalindromicSubsequence.js)
  * [MaxNonAdjacentSum](https://github.com/TheAlgorithms/Javascript/blob/master/Dynamic-Programming/MaxNonAdjacentSum.js)
  * [MinimumCostPath](https://github.com/TheAlgorithms/Javascript/blob/master/Dynamic-Programming/MinimumCostPath.js)
  * [NumberOfSubsetEqualToGivenSum](https://github.com/TheAlgorithms/Javascript/blob/master/Dynamic-Programming/NumberOfSubsetEqualToGivenSum.js)