Citation info was added. Unit tests were adjusted to comply with
testthat 3.0.0. Funtion plot_frontier received an update in the part
with ggplot2 aestetics to be compatible with ggplot2 3.5.2+.
HDShOP 0.1.5
The package got improved to partially comply with the rOpenSci
standards. The documentation got updated.
HDShOP 0.1.2
Function nonlin_shrinkLW got fixes removing computational issues in
the case c>1.