Support Python 3.8

[ods]

Changes

Fixes #569

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• Add a new news fragment into the CHANGES folder
  • name it <issue_id>.<type> (e.g. 588.bugfix)
  • if you don't have an issue_id change it to the pr id after creating the PR
  • ensure type is one of the following:
    • .feature: Signifying a new feature.
    • .bugfix: Signifying a bug fix.
    • .doc: Signifying a documentation improvement.
    • .removal: Signifying a deprecation or removal of public API.
    • .misc: A ticket has been closed, but it is not of interest to users.
  • Make sure to use full sentences with correct case and punctuation, for example: Fix issue with non-ascii contents in doctest text files.

[codecov]

Codecov Report

Merging #669 into master will increase coverage by 0.10%.
The diff coverage is 99.34%.

@@            Coverage Diff             @@
##           master     #669      +/-   ##
==========================================
+ Coverage   97.90%   98.01%   +0.10%     
==========================================
  Files          29       29              
  Lines        5114     5192      +78     
==========================================
+ Hits         5007     5089      +82     
+ Misses        107      103       -4     

Flag	Coverage Δ
#cext	87.67% <98.69%> (+0.20%)	⬆️
#integration	97.97% <99.34%> (+0.10%)	⬆️
#purepy	97.53% <99.34%> (+0.11%)	⬆️
#unit	51.48% <42.48%> (+0.79%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
aiokafka/producer/transaction_manager.py	98.32% <85.71%> (+0.02%)	⬆️
aiokafka/client.py	98.13% <100.00%> (+0.33%)	⬆️
aiokafka/conn.py	94.10% <100.00%> (+0.09%)	⬆️
aiokafka/consumer/consumer.py	97.90% <100.00%> (+<0.01%)	⬆️
aiokafka/consumer/fetcher.py	97.64% <100.00%> (+0.47%)	⬆️
aiokafka/consumer/group_coordinator.py	99.03% <100.00%> (ø)
aiokafka/consumer/subscription_state.py	100.00% <100.00%> (ø)
aiokafka/producer/message_accumulator.py	98.88% <100.00%> (+<0.01%)	⬆️
aiokafka/producer/producer.py	98.50% <100.00%> (+<0.01%)	⬆️
aiokafka/producer/sender.py	99.54% <100.00%> (ø)
... and 12 more

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[tvoinarovskyi]

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