Update README for problem 115

Author: anirudhology

README.md

@@ -55,7 +55,8 @@ LeetCode solutions in Go programming language.
 | 102        | Binary Tree Level Order Traversal                         | [Solution](problems/tree/binary_tree_level_order_traversal.go)                             | Medium     | Binary Tree, BFS                      |
 | 104        | Maximum Depth Of Binary Tree                              | [Solution](problems/tree/maximum_depth_of_binary_tree.go)                                  | Easy       | Binary Tree, Recursion                |
 | 105        | Construct Binary Tree From Preorder And Inorder Traversal | [Solution](problems/tree/construct_binary_tree_from_preorder_and_inorder_traversal.go)     | Medium     | Binary Tree, DFS                      |
-| 110        | Balanced Binary Tree                                      | [Solution](problems/tree/balanced_binary_tree.go)                                          | Easy       | Binary Tree, DFs                      |
+| 110        | Balanced Binary Tree                                      | [Solution](problems/tree/balanced_binary_tree.go)                                          | Easy       | Binary Tree, DFS                      |
+| 115        | Distinct Subsequences                                     | [Solution](problems/dynamic_programming/distinct_subsequences.go)                          | Hard       | Dynamic Programming                   |
 | 121        | Best Time To Buy And Sell Stocks                          | [Solution](problems/sliding_window/best_time_to_buy_and_sell_stocks.go)                    | Easy       | Sliding Window                        |
 | 124        | Binary Tree Maximum Path Sum                              | [Solution](problems/tree/binary_tree_maximum_path_sum.go)                                  | Hard       | Binary Tree, DFS                      |
 | 125        | Valid Palindrome                                          | [Solution](problems/strings/valid_palindrome.go)                                           | Medium     | String, Two Pointers                  |