fix 3.6 support

[thehesiod]

No description provided.

[codecov]

Codecov Report

Merging #935 (b014cc9) into master (0c6c571) will decrease coverage by 0.02%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##           master     #935      +/-   ##
==========================================
- Coverage   86.66%   86.64%   -0.03%     
==========================================
  Files          52       52              
  Lines        5265     5272       +7     
==========================================
+ Hits         4563     4568       +5     
- Misses        702      704       +2     

Flag	Coverage Δ
unittests	86.64% <80.00%> (-0.03%)	⬇️

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Impacted Files	Coverage Δ
tests/botocore/test_credentials.py	97.81% <50.00%> (-0.24%)	⬇️
aiobotocore/__init__.py	100.00% <100.00%> (ø)
aiobotocore/config.py	100.00% <100.00%> (ø)
tests/test_config.py	100.00% <100.00%> (ø)

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