v2.1.0

• unzip_process() now does not fail randomly on Windows (#60).

• Now all functions handle Unicode paths correctly, on Windows
  as well (#42, #53).

• unzip_process() now works when R library is on different drive
  than exdir on Windows (#45)

• zip functions now have a mode argument to choose how files and
  directories are assembled into the archive. See the docs for
  details.

• zip functions now have a root argument, zip changes the working
  directory to this before creating the archive, so all files are
  relative to root.

• zip() and zip_append() are not deprecated any more, as it was
  hard to achieve the same functionality with the other zip functions.