add flake8 to pre-commit config and required mypy version

[tchklovski]

a bit of housekeeping -- bump dev requirements, add comments to requirements-dev.txt and make default pre-commit config run flake8 check

This is a small change.

Checklist

• [x] Does the PR have an informative, carefully chosen title?
• [x] Have you followed the other Coding standards?
• [x] Applied labels to the PR

[github-actions[bot]]

Docstring Coverage :memo:

docstring coverage details

| Name | Total | Miss | Cover | Cover% | |----------------------|-------------|------------|-------------|--------------| | example.py | 2 | 0 | 2 | 100% | | **TOTAL** | 2 | 0 | 2 | 100.0% |

PASSED (minimum: 100.0%, actual: 100.0%)

[codecov[bot]]

Codecov Report

Merging #49 (74a293d) into main (8a4422a) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              main       #49   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines            5         5           
=========================================
  Hits             5         5           

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