Fix aiohttp wait for closed ssl connections

[leszekhanusz]

Workaround for issue aiohttp #1925

Should fix error "RuntimeError: Event loop is closed" when using gql-cli under windows with a https backend

[codecov-io]

Codecov Report

Merging #153 into master will decrease coverage by 1.45%.
The diff coverage is 56.25%.

@@             Coverage Diff             @@
##            master     #153      +/-   ##
===========================================
- Coverage   100.00%   98.54%   -1.46%     
===========================================
  Files           14       14              
  Lines          927      959      +32     
===========================================
+ Hits           927      945      +18     
- Misses           0       14      +14     

Impacted Files	Coverage Δ
gql/transport/aiohttp.py	87.27% <56.25%> (-12.73%)	⬇️

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[codecov-commenter]

Codecov Report

Merging #153 (c55d37b) into master (7f402c8) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #153   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           22        22           
  Lines         1763      1797   +34     
=========================================
+ Hits          1763      1797   +34     

Impacted Files	Coverage Δ
gql/transport/aiohttp.py	100.00% <100.00%> (ø)

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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