📦 Changelog - RegressionMadeSimple

Need to upgrade from v3? See the Migration Guide to v4.0.0.

• String model names removed: wrapper and function API calls like model="linear" now raise errors.
• Class-based model specification required: pass model classes such as model=rms.models.Linear.

• Model registry remains available under rms.models for Linear, Quadratic, Cubic, and CustomCurve.
• Wrapper API aligned around typed model classes only.
• Function API (regressionmadesimple.api.fit) aligned to class-based model input.

• Model Registry Pattern: Access models via rms.models.Linear, rms.models.Quadratic, rms.models.Cubic, and rms.models.CustomCurve.
• Enhanced Base Class: Refactored base class with common functionality for all models.
• Model Serialization: Save/load trained models with save_model() and load_model().
• Additional Scoring Metrics: r2_score(), mae(), and rmse().

• v3 introduced class-based model selection as the recommended path.
• v4 completed that migration by removing string-based model selection.
• See Migration Guide to v3.0.0 for legacy transition details.

• Major package rewrite. See the v1 → v2 Migration Guide.