Remove unwraps in the code

[wlwatkins]

Hi,

Would it be possible to remove unwraps in the code.

I'm hitting the unwrap here and thus can catch it
argmin-0.11.0\src\solver\neldermead\mod.rs - line 329

    fn init(
        &mut self,
        problem: &mut Problem<O>,
        state: IterState<P, (), (), (), (), F>,
    ) -> Result<(IterState<P, (), (), (), (), F>, Option<KV>), Error> {
        self.params
            .iter_mut()
            .for_each(|(p, c)| *c = problem.cost(p).unwrap()); // Replace with "?"

        self.sort_param_vecs();

        Ok((
            state.param(self.params[0].0.clone()).cost(self.params[0].1),
            None,
        ))
    }