Removed broken link.

Author: John Washam

README.md

@@ -1731,7 +1731,6 @@ You're never really done.
 - ### k-D Trees
     - Great for finding number of points in a rectangle or higher dimension object
     - A good fit for k-nearest neighbors
-    - [Kd Trees (video)](https://www.youtube.com/watch?v=W94M9D_yXKk)
     - [kNN K-d tree algorithm (video)](https://www.youtube.com/watch?v=Y4ZgLlDfKDg)
 
 - ### Skip lists