Update README.md

Author: zerone0x

README.md

@@ -802,7 +802,7 @@ if you can identify the runtime complexity of different algorithms. It's a super
     - [ ] [Heap Sort (video)](https://www.coursera.org/lecture/data-structures/heap-sort-hSzMO)
     - [ ] [Building a heap (video)](https://www.coursera.org/lecture/data-structures/building-a-heap-dwrOS)
     - [ ] [MIT: Heaps and Heap Sort (video)](https://www.youtube.com/watch?v=B7hVxCmfPtM&index=4&list=PLUl4u3cNGP61Oq3tWYp6V_F-5jb5L2iHb)
-    - [ ] [MIT 6.006 Introduction to Algorithms:Binary Heaps](https://www.youtube.com/watch?v=Xnpo1atN-Iw&list=PLUl4u3cNGP63EdVPNLG3ToM6LaEUuStEY&index=12)
+    - [ ] [MIT 6.006 Introduction to Algorithms: Binary Heaps](https://www.youtube.com/watch?v=Xnpo1atN-Iw&list=PLUl4u3cNGP63EdVPNLG3ToM6LaEUuStEY&index=12)
     - [ ] [CS 61B Lecture 24: Priority Queues (video)](https://archive.org/details/ucberkeley_webcast_yIUFT6AKBGE)
     - [ ] [Linear Time BuildHeap (max-heap)](https://www.youtube.com/watch?v=MiyLo8adrWw)
     - [ ] [[Review] Heap (playlist) in 13 minutes (video)](https://www.youtube.com/playlist?list=PL9xmBV_5YoZNsyqgPW-DNwUeT8F8uhWc6)