build(deps-dev): bump flake8 from 3.7.9 to 3.9.0

[dependabot-preview[bot]]

Bumps flake8 from 3.7.9 to 3.9.0.

Commits

• 434c108 Release 3.9.0
• 7c96c1e Merge branch 'pycodestyle_2_7_0' into 'master'
• 40aba49 upgrade pycodestyle to 2.7.0
• ac9c66e Add indent-size option
• fd71b86 Merge branch 'pyflakes_3_3' into 'master'
• 1eccf9a upgrade pyflakes to 2.3.x
• 6de8252 Merge branch 'crlf_stdin' into 'master'
• 0bf8d2a ensure crlf line endings of stdin are handled properly
• ff433b2 Merge branch 'fix_linters' into 'master'
• 14857c9 fix test which was not testing anything
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Dependabot tried to add @shekhar-shubhendu and @noandrea as reviewers to this PR, but received the following error from GitHub:

POST https://api.github.com/repos/aeternity/aepp-sdk-python/pulls/434/requested_reviewers: 422 - Reviews may only be requested from collaborators. One or more of the users or teams you specified is not a collaborator of the aeternity/aepp-sdk-python repository. // See: https://docs.github.com/rest/reference/pulls#request-reviewers-for-a-pull-request

[codecov[bot]]

Codecov Report

Merging #434 (f168e52) into develop (58ac2d1) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #434   +/-   ##
========================================
  Coverage    77.80%   77.80%           
========================================
  Files           18       18           
  Lines         2785     2785           
========================================
  Hits          2167     2167           
  Misses         618      618           

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[dependabot-preview[bot]]

Superseded by #441.