feat: BernoulliNB (#31)

* feat: BernoulliNB

* Move preprocessing to a trait in linalg/stats.rs

src/naive_bayes/mod.rs

@@ -64,10 +64,12 @@ impl<T: RealNumber, M: Matrix<T>, D: NBDistribution<T, M>> BaseNaiveBayes<T, M,
         Ok(y_hat)
     }
 }
+mod bernoulli;
 mod categorical;
 mod gaussian;
 mod multinomial;
 
+pub use bernoulli::{BernoulliNB, BernoulliNBParameters};
 pub use categorical::{CategoricalNB, CategoricalNBParameters};
 pub use gaussian::{GaussianNB, GaussianNBParameters};
 pub use multinomial::{MultinomialNB, MultinomialNBParameters};