Function wilks

pub fn wilks(gender: Gender, bodyweight: f64) -> f64

Compute the wilks coefficient for a lifter, using the original formula

https://en.wikipedia.org/wiki/Wilks_coefficient

use fitnesstools::{wilks, Gender};
let wilks_coefficient = wilks(Gender::Male, 80.0);

assert_eq!(wilks_coefficient, 0.6826985901683169);