Use flake8

[jpmckinney]

• chore: Remove unused imports
• chore: Run "autopep8 --max-line-length 119 --in-place -r ." and make manual flake8 fixes

[codecov[bot]]

Codecov Report

Merging #445 (49fae3e) into master (b8b3f1e) will decrease coverage by 0.66%. The diff coverage is 83.33%.

:exclamation: Current head 49fae3e differs from pull request most recent head a8ac002. Consider uploading reports for the commit a8ac002 to get more accurate results

@@            Coverage Diff             @@
##           master     #445      +/-   ##
==========================================
- Coverage   82.52%   81.86%   -0.67%     
==========================================
  Files          22       22              
  Lines        1013     1009       -4     
==========================================
- Hits          836      826      -10     
- Misses        177      183       +6     

Flag	Coverage Δ
unittests	81.86% <83.33%> (-0.67%)	:arrow_down:

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

Impacted Files	Coverage Δ
scrapyd/_deprecate.py	0.00% <ø> (-33.34%)	:arrow_down:
scrapyd/interfaces.py	100.00% <ø> (ø)
scrapyd/launcher.py	44.87% <0.00%> (ø)
scrapyd/runner.py	97.22% <ø> (ø)
scrapyd/scripts/scrapyd_run.py	0.00% <ø> (ø)
scrapyd/utils.py	88.13% <50.00%> (-0.10%)	:arrow_down:
scrapyd/webservice.py	68.96% <66.66%> (ø)
scrapyd/__init__.py	100.00% <100.00%> (ø)
scrapyd/eggstorage.py	100.00% <100.00%> (ø)
scrapyd/environ.py	82.22% <100.00%> (ø)
... and 3 more

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