docs: create changelog (#102)

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

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## Added
+- L2 regularization penalty to the Logistic Regression
+- Getters for the naive bayes structs
+- One hot encoder
+- Make moons data generator
+- Support for WASM.
+
+## Changed
+- Make serde optional
+
+## [0.2.0] - 2021-01-03
+
+### Added
+- DBSCAN
+- Epsilon-SVR, SVC
+- Ridge, Lasso, ElasticNet
+- Bernoulli, Gaussian, Categorical and Multinomial Naive Bayes
+- K-fold Cross Validation
+- Singular value decomposition
+- New api module
+- Integration with Clippy
+- Cholesky decomposition
+
+### Changed
+- ndarray upgraded to 0.14
+- smartcore::error:FailedError is now non-exhaustive
+- K-Means
+- PCA
+- Random Forest
+- Linear and Logistic Regression
+- KNN
+- Decision Tree
+
+## [0.1.0] - 2020-09-25
+
+### Added
+- First release of smartcore.
+- KNN + distance metrics (Euclidian, Minkowski, Manhattan, Hamming, Mahalanobis)
+- Linear Regression (OLS)
+- Logistic Regression
+- Random Forest Classifier
+- Decision Tree Classifier
+- PCA
+- K-Means
+- Integrated with ndarray
+- Abstract linear algebra methods
+- RandomForest Regressor
+- Decision Tree Regressor
+- Serde integration
+- Integrated with nalgebra
+- LU, QR, SVD, EVD
+- Evaluation Metrics