Delete temp model file after it's done #60.

src/mednet/scripts/upload.py

@@ -181,3 +181,5 @@ def upload(
         mlflow.log_artifact(evaluation_file)
         mlflow.log_artifact(evaluation_meta_file)
         mlflow.log_artifact(evaluation_log_file)
+    # delete temporary file as no need it after logging.
+    train_model_temp_file.unlink()