Run cargo clippy --fix (#250)

* Run `cargo clippy --fix`
* Run `cargo clippy --all-features --fix`
* Fix other clippy warnings
* cargo fmt

Co-authored-by: Luis Moreno <morenol@users.noreply.github.com>

src/metrics/cluster_hcv.rs

@@ -98,8 +98,8 @@ mod tests {
         let mut scores = HCVScore::new();
         scores.compute(&v1, &v2);
 
-        assert!((0.2548 - scores.homogeneity.unwrap() as f64).abs() < 1e-4);
-        assert!((0.5440 - scores.completeness.unwrap() as f64).abs() < 1e-4);
-        assert!((0.3471 - scores.v_measure.unwrap() as f64).abs() < 1e-4);
+        assert!((0.2548 - scores.homogeneity.unwrap()).abs() < 1e-4);
+        assert!((0.5440 - scores.completeness.unwrap()).abs() < 1e-4);
+        assert!((0.3471 - scores.v_measure.unwrap()).abs() < 1e-4);
     }
 }