fix timeout issue

[thehesiod]

unfortunately this doesn't completely fix the issue until aio-libs/aiohttp#3053 is fixed

[codecov]

Codecov Report

Merging #593 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #593   +/-   ##
=======================================
  Coverage   92.38%   92.38%           
=======================================
  Files           8        8           
  Lines         499      499           
=======================================
  Hits          461      461           
  Misses         38       38

Impacted Files	Coverage Δ
aiobotocore/endpoint.py	92.59% <ø> (ø)	⬆️
aiobotocore/__init__.py	100% <100%> (ø)	⬆️

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