leap: Update link in README.md
Also update the link in .meta/hints in README.md
@@ -23,7 +23,7 @@ phenomenon, go watch [this youtube video][video].
[video]: http://www.youtube.com/watch?v=xX96xng7sAE
-You may use the [`arithmetic remainder` operator](https://doc.rust-lang.org/book/2018-edition/appendix-02-operators.html) to test for divisibility.
+You may use the [`arithmetic remainder` operator](https://doc.rust-lang.org/book/appendix-02-operators.html) to test for divisibility.
## Rust Installation
