support dataclasses with slots

[samuelcolvin]

No description provided.

[codecov]

Codecov Report

Merging #136 (23faa51) into main (1172e81) will increase coverage by 0.02%.
Report is 4 commits behind head on main.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #136      +/-   ##
==========================================
+ Coverage   96.27%   96.29%   +0.02%     
==========================================
  Files           8        8              
  Lines         725      729       +4     
  Branches      110      111       +1     
==========================================
+ Hits          698      702       +4     
  Misses         21       21              
  Partials        6        6              

Files Changed	Coverage Δ
devtools/prettier.py	98.04% <100.00%> (+0.03%)	⬆️

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