Log Message:
youtube-dl: Update to 20190716

Changes:
2019.07.16
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Extractors
+ [asiancrush] Add support for yuyutv.com, midnightpulp.com and cocoro.tv
  (#21281, #21290)
* [kaltura] Check source format URL (#21290)
* [ctsnews] Fix YouTube embeds extraction (#21678)
+ [einthusan] Add support for einthusan.com (#21748, #21775)
+ [youtube] Add support for invidious.mastodon.host (#21777)
+ [gfycat] Extend URL regular expression (#21779, #21780)
* [youtube] Restrict is_live extraction (#21782)

2019.07.14
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Extractors
* [porn91] Fix extraction (#21312)
+ [yandexmusic] Extract track number and disk number (#21421)
+ [yandexmusic] Add support for multi disk albums (#21420, #21421)
* [lynda] Handle missing subtitles (#20490, #20513)
+ [youtube] Add more invidious instances to URL regular expression (#21694)
* [twitter] Improve uploader id extraction (#21705)
* [spankbang] Fix and improve metadata extraction
* [spankbang] Fix extraction (#21763, #21764)
+ [dlive] Add support for dlive.tv (#18080)
+ [livejournal] Add support for livejournal.com (#21526)
* [roosterteeth] Fix free episode extraction (#16094)
* [dbtv] Fix extraction
* [bellator] Fix extraction
- [rudo] Remove extractor (#18430, #18474)
* [facebook] Fallback to twitter:image meta for thumbnail extraction (#21224)
* [bleacherreport] Fix Bleacher Report CMS extraction
* [espn] Fix fivethirtyeight.com extraction
* [5tv] Relax video URL regular expression and support https URLs
* [youtube] Fix is_live extraction (#21734)
* [youtube] Fix authentication (#11270)