style: change park to snake_case

src/predict.py

@@ -58,7 +58,7 @@ def get_prediction(list_folder, model_file, output_file) -> None:
             try:
                 dict_predictions.append(
                     {
-                        "Park": folder.split("/")[-1],
+                        "park": folder.split("/")[-1],
                         "prediction": add_prediction_to_json(predictions),
                     }
                 )