devtools::install_github("jespermaag/gganatogram")
WARNING: Rtools is required to build R packages, but is not currently installed.
Please download and install Rtools custom from https://cran.r-project.org/bin/windows/Rtools/.
Downloading GitHub repo jespermaag/gganatogram@master
Error in utils::download.file(url, path, method = method, quiet = quiet, :
cannot open URL 'https://api.github.com/repos/jespermaag/gganatogram/tarball/master'