less verbose warning about single threaded behavior on windows

[samtkaplan]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 77.29%. Comparing base (e88bd3b) to head (fd96c2f).
Report is 3 commits behind head on master.

Files	Patch %	Lines
src/AzStorage.jl	66.66%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #67   +/-   ##
=======================================
  Coverage   77.29%   77.29%           
=======================================
  Files           1        1           
  Lines         370      370           
=======================================
  Hits          286      286           
  Misses         84       84           

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