SuperMemoRS

implementation of supermemo2 for rust

todo

• support for other versions of supermemo
• support for forks of SM2 such as the one used by anki

usage

```rust

fn incorrectresponsefirsttry() { let res = SuperMemo2::new().calc(0, 0, 2.5, 0); asserteq!(res, (0, 0, 2.5, 1)); }

fn gradeovermaxlength() { supermemo2(50, 2, 1.3, 6); } ```