Reorganized Rabin-Karp. Added video on efficient implementation of ro…

…lling hashes.

README.md

@@ -1131,7 +1131,7 @@ You'll get more graph practice in Skiena's book (see Books section below) and th
         - [slides](http://gotocon.com/dl/goto-berlin-2013/slides/SteveFreeman_TestDrivenDevelopmentThatsNotWhatWeMeant.pdf)
     - [ ] [TDD is dead. Long live testing.](http://david.heinemeierhansson.com/2014/tdd-is-dead-long-live-testing.html)
     - [ ] [Is TDD dead? (video)](https://www.youtube.com/watch?v=z9quxZsLcfo)
-    - [ ] V[ideo series (152 videos) - not all are needed (video)](https://www.youtube.com/watch?v=nzJapzxH_rE&list=PLAwxTw4SYaPkWVHeC_8aSIbSxE_NXI76g)
+    - [ ] [Video series (152 videos) - not all are needed (video)](https://www.youtube.com/watch?v=nzJapzxH_rE&list=PLAwxTw4SYaPkWVHeC_8aSIbSxE_NXI76g)
     - [ ] [Test-Driven Web Development with Python](http://www.obeythetestinggoat.com/pages/book.html#toc)
     - [ ] Dependency injection:
         - [ ] [video](https://www.youtube.com/watch?v=IKD2-MAkXyQ)