Suppress flake8 B011 warning

setup.cfg

@@ -12,6 +12,10 @@ extend-ignore =
     # B007: Loop control variable 'keyword' not used within the loop body.
     #       If this is intended, start the name with an underscore.
     B007
+
+    # B011: Do not call assert False since python -O removes these calls.
+    #       Instead callers should raise AssertionError().
+    B011
 
 max-line-length = 110