Fix flake8 config to load properly in precommit

Also set B019 as ignored.

.flake8

@@ -1,11 +1,5 @@
 [flake8]
-exclude = .git,.tox,__pycache__,.eggs,dist,.venv*,docs,build,_build
-# we enforce 80 char width with `black` "loosely", so flake8 should be set to
-# not fail on up to 90 chars of width
+exclude = .git,.tox,__pycache__,dist,.venv*,docs,build
 max-line-length = 90
-
-# based on the flake8 conf for `black` itself:
-#   https://github.com/ambv/black/blob/master/.flake8
-#
-# W503/W504 conflict, black causes E203
-ignore = W503,W504,E203,
+# black related: W503/W504 conflict, black causes E203
+ignore = W503,W504,E203,B019

.pre-commit-config.yaml

@@ -26,6 +26,7 @@ repos:
   rev: 7.1.0
   hooks:
     - id: flake8
+      args: ['--config', '.flake8']
       additional_dependencies:
         - 'flake8-bugbear==24.1.17'
         - 'flake8-typing-as-t==0.0.3'