install issue without git

[dtm2451]

Some of my colleagues have reported having issues with the install instructions noted in your README, so I just wanted to pass along what we've been using in case others have the same error:

> devtools::install_git("https://git.web.rug.nl/P278949/FastCAR")
Error: Failed to install 'unknown package' from Git:
  Git does not seem to be installed on your system.

Our alternative that doesn't seem to require a local git installation:

devtools::install_github("LungCellAtlas/FastCAR")

We've used this path successfully within a Singularity container that didn't have git installed.

[rocanja]

Thanks for posting this, it helped me resolve the same error message on my system!