Thanks for the amazing package!

In order to render RMarkdown on a Linux operating system outside of RStudio, it requires to pandoc-citeproc available. However, it is not explicitly stated in the DESCRIPTION file under SystemRequirements. I think it would be useful if it were. For instance, pak::pak("rmarkdown") then could auto-detect that as system dependency and install it during the installation.

I’m happy to make a PR if you think it’s worth adding it.