Changed to use named constructor 'from_parent'

[ubaumann]

Fix for pytest 6.0.0

https://docs.pytest.org/en/stable/deprecations.html#node-construction-changed-to-node-from-parent

[ubaumann]

Fix for #187 and #177

[coveralls]

Coverage decreased (-0.3%) to 77.969% when pulling 84cbc4c on ubaumann:from_parent into f436ccc on klen:develop.

[felixonmars]

There is one test failure after this patch, not sure if it's related:

=================================== FAILURES ===================================
______________________________ test_ignore_select ______________________________

    def test_ignore_select():
        options = parse_options()
        options.ignore = ['E301', 'D102']
        options.linters = ['pycodestyle', 'pydocstyle', 'pyflakes', 'mccabe']
        errors = run('dummy.py', options=options)
>       assert len(errors) == 32
E       assert 33 == 32
E        +  where 33 = len([<Error: D100 pydocstyle>, <Error: E265 pycodestyle>, <Error: E265 pycodestyle>, <Error: D101 pydocstyle>, <Error: D107 pydocstyle>, <Error: D105 pydocstyle>, ...])

tests/test_config.py:31: AssertionError

[ubaumann]

Checkout this pull request: #188
It fixes the failing test

[felixonmars]

Ah great... Thanks a lot!

[hkam40k]

Is this going to get merged any time soon?

[klen]

@ubaumann Thank you for the PR. Finally the problem has been fixed.