Implement SVR and SVR kernels with Enum. Add tests for argsort_mut (#303)

* Add tests for argsort_mut
* Add formatting and cleaning up .github directory
* fix clippy error. suggestion to use .contains()
* define type explicitly for variable jstack
* Implement kernel as enumerator
* basic svr and svr_params implementation
* Complete enum implementation for Kernels. Implement search grid for SVR. Add documentation.
* Fix serde configuration in cargo clippy
*  Implement search parameters (#304)
* Implement SVR kernels as enumerator
* basic svr and svr_params implementation
* Implement search grid for SVR. Add documentation.
* Fix serde configuration in cargo clippy
* Fix wasm32 typetag
* fix typetag
* Bump to version 0.4.2

src/neighbors/mod.rs

@@ -64,7 +64,7 @@ impl KNNWeightFunction {
             KNNWeightFunction::Distance => {
                 // if there are any points that has zero distance from one or more training points,
                 // those training points are weighted as 1.0 and the other points as 0.0
-                if distances.iter().any(|&e| e == 0f64) {
+                if distances.contains(&0f64) {
                     distances
                         .iter()
                         .map(|e| if *e == 0f64 { 1f64 } else { 0f64 })