v0.1.1 - Add Confusion Matrix

Release Note for RustyML v.0.1.1

Added

• Add function preliminary_check in machine_learning module to performs validation checks on the input data matrices
• Add confusion matrix in math module

Changed

• Change type of field coefficients of struct LinearRegression from Option<Vec<f64>> to Option<Array1<f64>>
• Change the output of some methods of struct LinearRegression from Vec<f64> to Array1<f64>
• Change variant InputValidationError of enum type ModelError from InputValidationError(&str) to InputValidationError(String)