Fix flake8 issues

Author: rmk135

.flake8

@@ -8,7 +8,7 @@ per-file-ignores =
     examples/containers/traverse.py: E501
     examples/providers/async.py: F841
     examples/providers/async_overriding.py: F841
-    examples/wiring/*: F841
+    examples/wiring/*: F821,F841
 
 [pydocstyle]
 ignore = D100,D101,D102,D105,D106,D107,D203,D213

setup.cfg

@@ -89,8 +89,8 @@ commands=
 deps=
     flake8
 commands=
-    flake8 --max-complexity=10 src/dependency_injector/
-    flake8 --max-complexity=10 examples/
+    flake8 src/dependency_injector/
+    flake8 examples/
 
 [testenv:pydocstyle]
 deps=