Update upstream source from tag 'upstream/2019.09.28'

[youtubedl] / setup.cfg

[wheel]
universal = True

[flake8]
exclude = youtube_dl/extractor/__init__.py,devscripts/buildserver.py,devscripts/lazy_load_template.py,devscripts/make_issue_template.py,setup.py,build,.git,venv
ignore = E402,E501,E731,E741,W503