ResultProxy __aiter__ issue fixed (#317)

[fidemin]

What do these changes do?

About issue #317 . The reason of the issue is async def __aiter__ in ResultProxy. async for row in cursor has raise TypeError: 'async for' received an object from __aiter__ that does not implement __anext__: coroutine in 3.7.

Are there changes in behavior for the user?

Nope.

Related issue number

#317

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• If you provide code modification, please add yourself to CONTRIBUTORS.txt
  • The format is <Name> <Surname>.
  • Please keep alphabetical order, the file is sorted by names.
• 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 #405 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #405   +/-   ##
=======================================
  Coverage   92.28%   92.28%           
=======================================
  Files           9        9           
  Lines        1180     1180           
  Branches      172      172           
=======================================
  Hits         1089     1089           
  Misses         64       64           
  Partials       27       27

Impacted Files	Coverage Δ
aiomysql/sa/result.py	92% <100%> (ø)	⬆️

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[Askaholic]

This has already been fixed in #403. Have just been waiting on deployment for a month and a half now.