python3-distro: update to version 1.6.0

python3-distro: update to version 1.6.0

- BACKWARDS COMPATIBILITY:

  - Deprecated the distro.linux_distribution() function. Use
  distro.id(), distro.version() and distro.name() instead [#296]
  - Deprecated Python 2.7, 3.4 and 3.5 support. Further releases will
  only support Python 3.6+

- ENHANCEMENTS:

  - Added type hints to distro module [#269]
  - Added __version__ for checking distro version [#292]
  - Added support for arbitrary rootfs via the root_dir parameter
  [#247]
  - Added the --root-dir option to CLI [#161]
  - Added fallback to /usr/lib/os-release when /etc/os-release isn't
  available [#262]

- BUG FIXES:

  - Fixed subprocess.CalledProcessError when running lsb_release
  [#261]
  - Ignore /etc/iredmail-release file while parsing distribution
  [#268]
  - Use a binary file for /dev/null to avoid TextIOWrapper overhead
  [#271]

- RELEASE:

 - Moved repository from nir0s/distro to python-distro/distro on
 GitHub.

Signed-off-by: Javier Marcet <javier@marcet.info>