[Borgbackup] dnf upgrade on fedora 28 appears to break borg

[Sitaram Chamarty]

A "dnf upgrade" on fedora 28 appears to break borg.  Not sure
what "msgpack" is but perhaps they made some unexpected change
between 0.5.5 and 0.5.6?

For now I downgraded by `dnf install python3-msgpack-0.5.5`,
which also downgraded borg to 1.1.4.  1.1.4 is fine for me, so I
actually don't have an issue for now, but I thought I should
report it anyway.

regards
sitaram

(The following is from before the downgrade of course)

# borg -V
Traceback (most recent call last):
  File "/usr/bin/borg", line 6, in <module>
    from pkg_resources import load_entry_point
  File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3095, in <module>
    @_call_aside
  File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3079, in _call_aside
    f(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3108, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 570, in _build_master
    ws.require(__requires__)
  File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 888, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 774, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'msgpack-python!=0.5.0,!=0.5.1,!=0.5.2,!=0.5.3,!=0.5.4,!=0.5.5,<=0.5.6,>=0.4.6' distribution was not found and is required by borgbackup

# rpm -qa --last | grep -i -e msgpack -e borg 
borgbackup-1.1.7-1.fc28.x86_64                Thu 27 Sep 2018 09:27:34 AM IST
msgpack-3.1.0-1.fc28.x86_64                   Wed 26 Sep 2018 05:50:50 PM IST
python3-msgpack-0.5.6-5.fc28.x86_64           Tue 25 Sep 2018 10:28:13 AM IST