kfre 0.1.12

Patch Release

• Package version fix in min_readme.md citation section
• Python version fix in min_readme.md
• Python version fix from 3.74 to 3.7.4
• new functions for classifying outcomes and ckd stages
  • class_esrd_outcome
class_ckd_stages
• new functions for performance assessment:
  • plot_kfre_metrics
  • eval_kfre_metrics
    • roc_auc curves
    • precision-recall curves
  • performance metrics:
    - Precision/PPV
    - Average Precision
    - Sensitivity
    - Specificity
    - AUC ROC
    - Brier Score