indicate availability on CRAN
indicate availability on CRAN

following the dplyr readme as a template
pozypakya/readxl,nvoron23/readxl,nvoron23/readxl,warnes/readxl,NikhilMIT2013/readxl,pozypakya/readxl,nvoron23/readxl,NikhilMIT2013/readxl,NikhilMIT2013/readxl,warnes/readxl,rdoering/readxl,pozypakya/readxl,warnes/readxl,rdoering/readxl,rdoering/readxl