keep package_janitor functions sync-ed

[wibeasley]

so I can blindly copy & paste the file from one source to the other after changes.

• https://github.com/OuhscBbmc/OuhscMunge/blob/master/R/package-janitor.R
• https://gist.github.com/wibeasley/2c5e7459b88ec28b9e8fa0c695b15ee3