chore: run pyupgrade --py36-plus

[mayeut]

No description provided.

[codecov]

Codecov Report

Merging #325 (38744fa) into master (613db39) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #325   +/-   ##
=======================================
  Coverage   89.35%   89.35%           
=======================================
  Files          23       23           
  Lines        1203     1203           
  Branches      254      254           
=======================================
  Hits         1075     1075           
  Misses         78       78           
  Partials       50       50           

Impacted Files	Coverage Δ
auditwheel/lddtree.py	87.17% <100.00%> (ø)

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