Revert "compat!: Drop python 3.7 and 3.8 (#363)"

[tony]

This reverts commit 362068c.

[codecov]

Codecov Report

Merging #375 (35535c8) into master (d858e71) will decrease coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #375      +/-   ##
==========================================
- Coverage   88.54%   88.41%   -0.13%     
==========================================
  Files          16       16              
  Lines        1563     1563              
==========================================
- Hits         1384     1382       -2     
- Misses        179      181       +2     

Impacted Files	Coverage Δ
tests/test_common.py	98.26% <0.00%> (-1.74%)	⬇️

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