Replace Missing Course with Lecture Playlist

Resolves #1234

README.md

@@ -344,7 +344,7 @@ Courses | Duration | Effort | Prerequisites
 [Compilers](https://www.edx.org/course/compilers) | 9 weeks | 6-8 hours/week | none
 [Introduction to Haskell](https://www.seas.upenn.edu/~cis194/fall16/)| 14 weeks | - | -
 [Learn Prolog Now!](https://www.let.rug.nl/bos/lpn//lpnpage.php?pageid=online) ([alternative](https://github.com/ossu/computer-science/files/6085884/lpn.pdf))*| 12 weeks | - | -
-[Software Debugging](https://www.udacity.com/course/software-debugging--cs259)| 8 weeks | 6 hours/week | Python, object-oriented programming
+[Software Debugging](https://www.youtube.com/playlist?list=PLAwxTw4SYaPkxK63TiT88oEe-AIBhr96A)| 8 weeks | 6 hours/week | Python, object-oriented programming
 [Software Testing](https://www.youtube.com/playlist?list=PLAwxTw4SYaPkWVHeC_8aSIbSxE_NXI76g) | 4 weeks | 6 hours/week | Python, programming experience
 
 (*) book by Blackburn, Bos, Striegnitz (compiled from [source](https://github.com/LearnPrologNow/lpn), redistributed under [CC license](https://creativecommons.org/licenses/by-sa/4.0/))