2.0.1

Improvements

• Only log online_clients if there are any (6e40555)

Bugs

• Handle connected clients on unexpected shutdown correctly (1ef4a3b)

Internal

• Use pylama for stylechecks (ae13390),
  fix error introduced by that (f878fef)
• Add Pipfile (a019278)
• Remove extra lines after encoding header (5ea2f6a)
• Lock dependencies in requirements.txt and testing_requirements.txt (187ae0a)
• Lock pendulum to version 1.5.1 for now because 2.0.0 contains
  incompatible changes (a019278, e92f5ea)