revdep issue template

Hi @MAINTAINER After installing data.table from github master,

data.table::update_dev_pkg()

And then running R CMD check on YOUR_PACKAGE, I get the following new failure, (which is not present if you use data.table from CRAN)

OUTPUT_FROM_FAILING_CHECK

data.table needs to ensure that updates do not break dependent packages like YOUR_PACKAGE, before uploading new versions to CRAN, so can you please submit an updated version of YOUR_PACKAGE to CRAN, that fixes this test failure? In particular, I would suggest to avoid DOING_WHAT_YOU_ARE_DOING_CURRENTLY, and instead DOING_SOMETHING_MORE_ROBUST.