Cheat sheets link is not valid

[szilard-nemeth]

From the main README.md, by clicking the Cheatsheets link, it gives 404.
The link is: https://github.com/bregman-arie/computer-networking/tree/cheatsheets/README.md

[AmirNaghibi]

correct link should be: https://github.com/bregman-arie/computer-networking/blob/master/cheatsheets/README.md