Update Readme.md

Author: wisdompeak

Readme.md

@@ -310,7 +310,7 @@
 [269.Alien-Dictionary](https://github.com/wisdompeak/LeetCode/tree/master/BFS/269.Alien-Dictionary) (H-) 
 [310.Minimum-Height-Trees](https://github.com/wisdompeak/LeetCode/tree/master/Tree/310.Minimum-Height-Trees) (H-) 
 [802.Find-Eventual-Safe-States](https://github.com/wisdompeak/LeetCode/tree/master/BFS/802.Find-Eventual-Safe-States) (H-) 
-1136.Parallel-Courses (TBD) 
+[1136.Parallel-Courses](https://github.com/wisdompeak/LeetCode/tree/master/BFS/1136.Parallel-Courses) (M) 
 [1203.Sort-Items-by-Groups-Respecting-Dependencies](https://github.com/wisdompeak/LeetCode/tree/master/BFS/1203.Sort-Items-by-Groups-Respecting-Dependencies) (H) 
 [1462.Course-Schedule-IV](https://github.com/wisdompeak/LeetCode/tree/master/BFS/1462.Course-Schedule-IV) (M)