Disable flake8 W503

W503 warning in Flake8 goes against PEP 8 recommendation, disable it to
make it compatible with black.

    W503 line break before binary operator

https://peps.python.org/pep-0008/#should-a-line-break-before-or-after-a-binary-operator

tox.ini

@@ -51,7 +51,7 @@ ignore_outcome = True
 
 [flake8]
 skip_install = true
-ignore = E501,E731,W504
+ignore = E501,E731,W503,W504
 exclude = dev_scripts/*,freshmaker/migrations/*,.tox/*,build/*,__pycache__,scripts/print_handlers_md.py,.copr/*,.env
 
 [testenv:docs]