wlsunset 0.4.0

This release works around an issue where the compositor gives a zero
gamma size, and adds support for toggling forced modes with SIGUSR1.

Support for xdg_output is also removed, as newer versions of wl_output
contain the necessary output name.

Kelvin C (2):
      Update README
      Update man-page

Kenny Levinsen (10):
      Force mode on SIGUSR1
      Change steps from 25K to 10K
      Calculate blend factor as double
      Remove xdg-output support
      Improve logging
      Free output name, skip storing description
      Explain the use of multiple locus better
      readme: Fix the list of forced modes
      Recreate controls on next set if gamma size is zero
      Bump version to 0.4.0

Mukund Sivaraman (1):
      Fix typo in manpage