git2rdata 0.3.0

New features

• write_vc() gains an optional split_by argument.
  See vignette("split_by") for more details.
• rename_variable() efficiently renames variables in a stored git2rdata
  object.

Bugfixes

• read_vc(), is_git2rdata() and is_git2rmeta() now yield a better message
  when both the data and metadata are missing.