Support Wasi as target (#216)

* Improve features
* Add wasm32-wasi as a target
* Update .github/workflows/ci.yml
Co-authored-by: morenol <22335041+morenol@users.noreply.github.com>

src/optimization/line_search.rs

@@ -129,7 +129,10 @@ impl<T: Float> LineSearchMethod<T> for Backtracking<T> {
 mod tests {
     use super::*;
 
-    #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
+    #[cfg_attr(
+        all(target_arch = "wasm32", not(target_os = "wasi")),
+        wasm_bindgen_test::wasm_bindgen_test
+    )]
     #[test]
     fn backtracking() {
         let f = |x: f64| -> f64 { x.powf(2.) + x };