Handle kwargs passed as positional arguments

[mschwager]

In the BadKwargUseLinter helper we can observe the following behavior:

def func(a, b='foo'):
    # ...
    return a * b

func(1, b='bar')  # Caught with BadKwargUseLinter
func(2, 'bar')  # Uncaught with BadKwargUseLinter

That is, kwargs passed as positional arguments will not be caught by BadKwargUseLinter. We could remedy this by supporting an additional piece of configuration in the BadKwargUseLinter.kwargs property. If we took another, optional configuration option like position we could detect this behavior.

This is somewhat of a fringe use-case. It may not be worth it to try and maintain the position of function kwargs since they could easily change out from underneath us.