remove export augmented_transform

Author: ablaom

src/MLJModelInterface.jl

@@ -84,8 +84,7 @@ export @mlj_model, metadata_pkg, metadata_model
 # model api
 export fit, update, update_data, transform, inverse_transform,
     fitted_params, predict, predict_mode, predict_mean, predict_median,
-    predict_joint, evaluate, clean!, reformat, training_losses,
-    augmented_transform
+    predict_joint, evaluate, clean!, reformat, training_losses
 
 # model traits
 for trait in MODEL_TRAITS