pin pypiwin32 version until upstream bug fixed

[meejah]

No description provided.

[codecov-io]

Codecov Report

Merging #464 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #464      +/-   ##
==========================================
- Coverage   90.09%   90.09%   -0.01%     
==========================================
  Files         144      144              
  Lines       27296    27296              
  Branches     3925     3925              
==========================================
- Hits        24593    24592       -1     
  Misses       1961     1961              
- Partials      742      743       +1

Impacted Files	Coverage Δ
src/allmydata/mutable/publish.py	95.65% <0%> (-1.02%)	⬇️
src/allmydata/stats.py	85.34% <0%> (-0.87%)	⬇️
src/allmydata/immutable/upload.py	95.25% <0%> (-0.28%)	⬇️
src/allmydata/immutable/downloader/share.py	95.29% <0%> (+2.46%)	⬆️

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[meejah]

Further evidence of some kind of Heisen-coverage -- this just changes one dependency line