Remove 3.7 (EOL) support, add 3.12

[graingert]

No description provided.

[graingert]

Closing in favour of #24

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d9226be) 100.00% compared to head (aa38168) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #25   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           15        15           
  Lines         1312      1306    -6     
  Branches       216       216           
=========================================
- Hits          1312      1306    -6     

Flag	Coverage Δ
3.10	99.92% <100.00%> (-0.01%)	⬇️
3.11	99.92% <100.00%> (-0.01%)	⬇️
3.12	99.92% <100.00%> (?)
3.12-dev	?
3.7	?
3.8	99.92% <100.00%> (-0.01%)	⬇️
3.9	99.92% <100.00%> (-0.01%)	⬇️
Ubuntu	99.92% <100.00%> (-0.01%)	⬇️
Windows	99.92% <100.00%> (-0.01%)	⬇️
macOS	99.92% <100.00%> (-0.01%)	⬇️
pypy-3.8	99.30% <100.00%> (-0.01%)	⬇️
pypy-3.9	99.30% <100.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.