Ignore exception name flake8 suggestion to avoid code changes

Signed-off-by: Enrico Usai <[email protected]>

Author: Enrico Usai

.flake8

@@ -7,6 +7,7 @@ ignore =
     D103, # Missing docstring in public function
     D104, # Missing docstring in public package
     D107, # Missing docstring in __init__
+    N818, # exception name should be named with an Error suffix
     W503, # line break before binary operator => Conflicts with black style.
 exclude =
     .tox,