Re-introduce python 3.8 support

[agrenott]

Close #33

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (14daf44)	2651	1971	74.35%
Head commit (224884e)	2651 (+0)	1971 (+0)	74.35% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#34)	6	6	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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