B017 - assertRaises - ignore when msg param is passed

[slw07g]

Consider suppressing B017 where msg= is passed to assertRaises, as it also validates the actual message in the raised exception matches msg.

Example:
assertRaises(Exception, msg="Some exception message")

It is equivalent to assertRaisesRegex(Exception, "^<regex_pattern>$") which does not trigger B017.

[slw07g]

Opened an issue in the flake8 repo.
PyCQA/flake8#1940

[slw07g]

Reopening because maybe this is the right repo for the issue.