fix event response iter

[thehesiod]

fixes #945

[codecov]

Codecov Report

Merging #946 (18fddbc) into master (e4ea0ed) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #946   +/-   ##
=======================================
  Coverage   86.74%   86.74%           
=======================================
  Files          55       55           
  Lines        5297     5298    +1     
=======================================
+ Hits         4595     4596    +1     
  Misses        702      702           

Flag	Coverage Δ
unittests	86.74% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
aiobotocore/eventstream.py	66.66% <100.00%> (ø)
tests/test_eventstreams.py	100.00% <100.00%> (ø)

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