Log Message:
youtube-dl: Update to 20190430

Changes:
version 2019.04.30

Extractors
* [openload] Use real Chrome versions (#20902)
- [youtube] Remove info el for get_video_info request
* [youtube] Improve extraction robustness
- [dramafever] Remove extractor (#20868)
* [adn] Fix subtitle extraction (#12724)
+ [ccc] Extract creator (#20355)
+ [ccc:playlist] Add support for media.ccc.de playlists (#14601, #20355)
+ [sverigesradio] Add support for sverigesradio.se (#18635)
+ [cinemax] Add support for cinemax.com
* [sixplay] Try extracting non-DRM protected manifests (#20849)
+ [youtube] Extract Youtube Music Auto-generated metadata (#20599, #20742)
- [wrzuta] Remove extractor (#20684, #20801)
* [twitch] Prefer source format (#20850)
+ [twitcasting] Add support for private videos (#20843)
* [reddit] Validate thumbnail URL (#20030)
* [yandexmusic] Fix track URL extraction (#20820)