Update Readme.md

Author: wisdompeak

Readme.md

@@ -328,6 +328,7 @@
 [741.Cherry-Pickup](https://github.com/wisdompeak/LeetCode/tree/master/Dynamic_Programming/741.Cherry-Pickup) (H-) 
 [887.Super-Egg-Drop](https://github.com/wisdompeak/LeetCode/tree/master/Dynamic_Programming/887.Super-Egg-Drop) (H) 
 [903.Valid-Permutations-for-DI-Sequence](https://github.com/wisdompeak/LeetCode/tree/master/Dynamic_Programming/903.Valid-Permutations-for-DI-Sequence) (H) 
+[920.Number-of-Music-Playlists](https://github.com/wisdompeak/LeetCode/tree/master/Dynamic_Programming/920.Number-of-Music-Playlists) (H) 
 [935.Knight-Dialer](https://github.com/wisdompeak/LeetCode/tree/master/Dynamic_Programming/935.Knight-Dialer) (M) 
 940.Distinct-Subsequences-II (H) 
 943.Find-the-Shortest-Superstring (H+) 
@@ -339,8 +340,7 @@
 123.Best-Time-to-Buy-and-Sell-Stock-III (H-) 
 [309.Best-Time-to-Buy-and-Sell-Stock-with-Cooldown](https://github.com/wisdompeak/LeetCode/tree/master/Dynamic_Programming/309.Best-Time-to-Buy-and-Sell-Stock-with-Cooldown) (H-) 
 [714.Best-Time-to-Buy-and-Sell-Stock-with-Transaction-Fee](https://github.com/wisdompeak/LeetCode/blob/master/Dynamic_Programming/714.Best-Time-to-Buy-and-Sell-Stock-with-Transaction-Fee) (H-) 
-552.Student-Attendance-Record-II (H) 
-[920.Number-of-Music-Playlists](https://github.com/wisdompeak/LeetCode/tree/master/Dynamic_Programming/920.Number-of-Music-Playlists) (H) 
+552.Student-Attendance-Record-II (H) 
 * ``two string converging`` 
 [010.Regular-Expression-Matching](https://github.com/wisdompeak/LeetCode/tree/master/Dynamic_Programming/010.Regular-Expression-Matching) (H) 
 [097.Interleaving-String](https://github.com/wisdompeak/LeetCode/tree/master/Dynamic_Programming/097.Interleaving-String) (H-)