change version to 0.2.3

change version to 0.2.2

update version number

Add functions api (reiinakano#7)

* introduce functions API.
refactor plot_confusion_matrix to use functions API

* refactor plot_roc_curve to use functions API

* refactor plot_ks_statistic to use functions API

* refactor plot_precision_recall_curve to use functions API

* refactor plot_feature_importances to use functions API

* refactor plot_learning_curve to use functions API

* refactor classifiers.plot_roc_curve to use cross-validation

* refactor classifiers.plot_ks_statistic to use cross-validation

* refactor classifiers.plot_precision_recall_curve to use cross-validation

* add plot_silhouette and plot_elbow_curve to Functions API

* fix cross-validation to work with string labels

* update readme to include Functions API

* add img

* add quickstart Functions API

* updated docs to add Functions API

change version to 0.1. first release