fix: Ignore pass multiple lines after docstring with flag

[DenverCoder1]

Fixes #176

• Updates useless_pass_line_numbers to ignore pass after a docstring when --ignore-pass-after-docstring is used, even if there are empty lines between the docstring and the pass.

Example where pass will be ignored by --ignore-pass-after-docstring when it was not previously:

class MyException(Exception):
    """Example class

    This is an example docstring for the class.
    """

    pass

[fsouza]

I wonder if we should support any number of blank lines between the docstring and pass? 🤔

[DenverCoder1]

I wonder if we should support any number of blank lines between the docstring and pass?

I'm not sure if it's necessary since there aren't any style guides or formatters I know of that would support more than one blank line after a docstring. I can think about it and see if it would be simple enough to implement.

[DenverCoder1]

I wonder if we should support any number of blank lines between the docstring and pass?

This is supported now by instead storing the previous non-empty line to check (instead of the previous two lines).

[fsouza]

Thank you!