[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

flake8_custom_error_messages/plugin.py

@@ -39,9 +39,7 @@ def after_init(self):
             # flake8 does not support parsing values containing spaces from config
             # files
             msgs = [
-                line.strip()
-                for line in error_messages.splitlines()
-                if line.strip()
+                line.strip() for line in error_messages.splitlines() if line.strip()
             ]
         else:
             # when parsed from the command line, the value is already a list