ParBayesianOptimization uses deprecated ggplot2 function aes_string()

[ellisdoro]

I get the following warning when using ParBayesianOptimization

aes_string() was deprecated in ggplot2 3.0.0. ℹ Please use tidy evaluation idioms with aes(). ℹ See also vignette("ggplot2-in-packages") for more information. ℹ The deprecated feature was likely used in the ParBayesianOptimization package. Please report the issue at https://github.com/AnotherSamWilson/ParBayesianOptimization/issues. This warning is displayed once every 8 hours. Call lifecycle::last_lifecycle_warnings() to see where this warning was generated.