Update

Author: nabenabe0928

README.md

@@ -1,5 +1,8 @@
 # This package is not maintained anymore. Please look at [the OptunaHub version](https://hub.optuna.org/visualization/plot_empirical_attainment_surface)
 
+> [!IMPORTANT]
+> See above.
+
 # Empirical attainment function for the bi-objective optimization visualization
 
 [![Build Status](https://github.com/nabenabe0928/empirical-attainment-func/workflows/Functionality%20test/badge.svg?branch=main)](https://github.com/nabenabe0928/empirical-attainment-func)