Repository address in the format
username/repo[/subdir][@ref|#pull]. Alternatively, you can
specify subdir and/or ref using the respective parameters
(see below); if both are specified, the values in repo take
User name. Deprecated: please include username in the
Desired git reference; could be a commit, tag, or branch name.
Defaults to master.
subdirectory within repo that contains the R package.
if TRUE suppresses output from this function.
your account username if you're attempting to install
a package hosted in a private repository (and your username is different