Changed course for Theory of Computation to the one in openMIT (#1125)

Resolves #1096

README.md

@@ -388,7 +388,7 @@ Courses | Duration | Effort | Prerequisites | Notes
 
 Courses | Duration | Effort | Prerequisites
 :-- | :--: | :--: | :--:
-[Theory of Computation](http://aduni.org/courses/theory/index.php?view=cw) ([Lectures](https://www.youtube.com/playlist?list=PLTke5lHMAdSNmi57H0DOTzClHPK6UwSTN)) | 8 weeks | 10 hours/week | discrete mathematics, logic, algorithms
+[Theory of Computation](https://ocw.mit.edu/courses/18-404j-theory-of-computation-fall-2020/) ([alt](http://aduni.org/courses/theory/index.php?view=cw)) | 13 weeks | 10 hours/week | [Mathematics for Computer Science](https://openlearninglibrary.mit.edu/courses/course-v1:OCW+6.042J+2T2019/about), logic, algorithms
 [Computational Geometry](https://www.edx.org/course/computational-geometry) | 16 weeks | 8 hours/week | algorithms, C++
 [Game Theory](https://www.coursera.org/learn/game-theory-1) | 8 weeks | 3 hours/week | mathematical thinking, probability, calculus