Tiny link typo to Yard [cheat sheet] causing a "Not Found" page error on target

Believe it or not this link `http://cheat.errtheblog.com/s/yard/` (with the slash at the end) returns a '404 Not Found' while this one works just fine `http://cheat.errtheblog.com/s/yard`
Merge pull request #369 from elgalu/patch-1

Tiny link typo to Yard [cheat sheet] causing a "Not Found" page error