Add flake8 B905 to extend-ignore in setup.cfg (#4391)

* Add flake8 `--ignore=B905,N818,W503`

* Add B905 to `extend-ignore` in setup.cfg (thanks @Skylion007), leave .pre-commit-config.yaml as-is on master.

Author: rwgk

setup.cfg

@@ -46,5 +46,5 @@ zip_safe = False
 max-line-length = 120
 show_source = True
 exclude = .git, __pycache__, build, dist, docs, tools, venv
-extend-ignore = E203, E722, B903, B950
+extend-ignore = E203, E722, B903, B905, B950
 extend-select = B9