read_rds_safe() tries to read an rds archive present in path. If it
cannot, it returns NULL. It uses file_version() to guess whcih arcive is
the most recent if more than one ar found.
Usage
read_rds_safe(path, archive)
Arguments
path
character, where to look for the archive.
archive
character, a pattern to find the archive.
Value
A character vector of length the number of lines read.
