v1.4.0

This is a big one!

Added

• Barriers.

Changed

• cli.main now takes an optional argument namespace so that users
  may define their own entrypoints. (#140, @maerteijn)
• Actor "message received" and "completed in x ms" log messages are
  now logged with the DEBUG level instead of INFO level. This
  improves throughput and makes logging much less verbose.
• The TimeLimit middleware no longer uses signals to trigger time
  limit handling. Instead it uses a background thread per worker
  process.
• Dramatiq now shuts itself down if any of the workers die
  unexpectedly (for example, if one of them is killed by the OOM
  killer).
• Windows is now supported (with some caveats)! (#119, @ryansm1)

Fixed

• Allow pipe_ignore option to be set at the actor level. (#100)
• Result encoder now defaults to the global encoder. (#108, @xdmiodz)
• Dot characters are now allowed in queue names. (#111)
• Tests are now run on Windows. (#113, @ryansm1)