Unable to install easyGgplot2

[statslady]

Hi, I am trying the charts as used in this link but not able to install the package. http://www.sthda.com/english/wiki/ggplot2-histogram-easy-histogram-graph-with-ggplot2-r-package

I tried the following commands: install.packages("devtools") library(devtools) install_github("easyGgplot2", "kassambara")

Please advise Thanks