Test on python 3.8

[sindrehan]

Description

Fixes #42

I've also bumped the version to 0.2.1, so we can push the latest updates to PyPi.

Checklist before merging

• [x] Run the tests while connected to a drone
• [x] Update the package version according to semver

[codecov[bot]]

Codecov Report

Merging #44 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff           @@
##           master     #44   +/-   ##
======================================
  Coverage    56.7%   56.7%           
======================================
  Files           6       6           
  Lines         328     328           
======================================
  Hits          186     186           
  Misses        142     142

Flag	Coverage Δ
#macos	56.7% <ø> (ø)	:arrow_up:
#ubuntu	56.7% <ø> (ø)	:arrow_up:
#windows	56.7% <ø> (ø)	:arrow_up:

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