fix for #815

[thehesiod]

No description provided.

[codecov]

Codecov Report

Merging #816 into master will increase coverage by 0.10%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #816      +/-   ##
==========================================
+ Coverage   89.20%   89.31%   +0.10%     
==========================================
  Files          16       16              
  Lines        1371     1385      +14     
==========================================
+ Hits         1223     1237      +14     
  Misses        148      148              

Impacted Files	Coverage Δ
aiobotocore/__init__.py	100.00% <100.00%> (ø)
aiobotocore/session.py	78.65% <100.00%> (+0.24%)	⬆️
aiobotocore/signers.py	95.74% <100.00%> (+0.43%)	⬆️

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