Update CRAN comments
Update CRAN comments

pozypakya/readxl,NikhilMIT2013/readxl,rdoering/readxl,warnes/readxl,pozypakya/readxl,nvoron23/readxl,warnes/readxl,warnes/readxl,NikhilMIT2013/readxl,NikhilMIT2013/readxl,nvoron23/readxl,nvoron23/readxl,rdoering/readxl,rdoering/readxl,pozypakya/readxl