Support python 3.7 and up

[fizyk]

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[codecov]

Codecov Report

Merging #26 (90046ce) into master (50c7623) will decrease coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #26      +/-   ##
==========================================
- Coverage   96.73%   96.66%   -0.08%     
==========================================
  Files           8        8              
  Lines         276      270       -6     
==========================================
- Hits          267      261       -6     
  Misses          9        9              

Flag	Coverage Δ
linux	89.62% <ø> (-0.23%)	⬇️
macos	95.92% <ø> (-0.09%)	⬇️

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Impacted Files	Coverage Δ
src/port_for/__init__.py	100.00% <ø> (ø)
src/port_for/api.py	96.20% <ø> (-0.05%)	⬇️
src/port_for/ephemeral.py	91.17% <ø> (-0.26%)	⬇️
src/port_for/store.py	94.11% <ø> (-0.12%)	⬇️
src/port_for/utils.py	100.00% <ø> (ø)
tests/test_cases.py	100.00% <ø> (ø)

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