Bug 1640405

Description of problem:
Running vdirsyncer fails Python backtrace which follows. This seems in common with the problem reported here:

https://bugs.archlinux.org/task/58987

Version-Release number of selected component (if applicable):
vdirsyncer-0.16.3-4.fc29.noarch
python3-click-log-0.3.2-3.fc29.noarch

How reproducible:
Every time

Steps to Reproduce:
1. Configure vdirsyncer
2. Run with "vdirsyncer -v WARNING sync"

Additional info:

Backtrace:

Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/pkg_resources/__init__.py", line 578, in _build_master
    ws.require(__requires__)
  File "/usr/lib/python3.7/site-packages/pkg_resources/__init__.py", line 895, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/lib/python3.7/site-packages/pkg_resources/__init__.py", line 786, in resolve
    raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.ContextualVersionConflict: (click-log 0.3.2 (/usr/lib/python3.7/site-packages), Requirement.parse('click-log<0.3.0,>=0.2.0'), {'vdirsyncer'})

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/bin/vdirsyncer", line 6, in <module>
    from pkg_resources import load_entry_point
  File "/usr/lib/python3.7/site-packages/pkg_resources/__init__.py", line 3112, in <module>
    @_call_aside
  File "/usr/lib/python3.7/site-packages/pkg_resources/__init__.py", line 3096, in _call_aside
    f(*args, **kwargs)
  File "/usr/lib/python3.7/site-packages/pkg_resources/__init__.py", line 3125, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/usr/lib/python3.7/site-packages/pkg_resources/__init__.py", line 580, in _build_master
    return cls._build_from_requirements(__requires__)
  File "/usr/lib/python3.7/site-packages/pkg_resources/__init__.py", line 593, in _build_from_requirements
    dists = ws.resolve(reqs, Environment())
  File "/usr/lib/python3.7/site-packages/pkg_resources/__init__.py", line 781, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'click-log<0.3.0,>=0.2.0' distribution was not found and is required by vdirsyncer