CRAN_Release.cmd: add reminder to add ?closed=1 to the milestone line
CRAN_Release.cmd: add reminder to add ?closed=1 to the milestone line

Rdatatable/data.table,Rdatatable/data.table,vlulla/data.table,vlulla/data.table,Rdatatable/data.table,vlulla/data.table,Rdatatable/data.table,vlulla/data.table,jangorecki/data.table,jangorecki/data.table,jangorecki/data.table,jangorecki/data.table