Remove deprecated loop keyword argument

[Cadair]

No description provided.

[codecov]

Codecov Report

Merging #88 (be36ee5) into main (8652805) will increase coverage by 0.15%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #88      +/-   ##
==========================================
+ Coverage   91.82%   91.98%   +0.15%     
==========================================
  Files           4        4              
  Lines         477      474       -3     
==========================================
- Hits          438      436       -2     
+ Misses         39       38       -1     

Impacted Files	Coverage Δ
parfive/downloader.py	95.57% <ø> (+0.29%)	⬆️

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