[adultswim] Updated to work with new site format (fixes #4317)
[nba] Improve _VALID_URL regex (fixes #4387)

Allows for optional trailing / or /index.html
[nba] Modernize
[nba] Add test for #4387
Merge remote-tracking branch 'cryptonaut/adultswim'
[ffmpeg] Improve version check and call it from hls (Fixes #4377)
[youtube] Modernize
Credit @cryptonaut for adultswim (#4388)
[test_utils] Make test more realistically (#4377)
[tagesschau] Look at the right place for download links
[nba] Remove unused import
[adultswim] PEP8
Allow iterators for playlist result entries
[twitch] Add login support (#3986)
[radio.de] Add support for radio.de websites (Closes #4393)
[prosiebensat1] Add support for playlists (fixes #4357)
[prosiebensat1] Fix broken tests
[extractor/common] Add description to playlist_result
[prosiebensat1] Improve and simplify
Merge branch 'akretz-master'