Log Message:
youtube-dl: Update net/youtube-dl to 20180822

Changes:
version 2018.08.22
------------------
Core
* [utils] Use pure browser header for User-Agent (#17236)

Extractors
+ [kinopoisk] Add support for kinopoisk.ru (#17283)
+ [yourporn] Add support for yourporn.sexy (#17298)
+ [go] Add support for disneynow.go.com (#16299, #17264)
+ [6play] Add support for play.rtl.hr (#17249)
* [anvato] Fallback to generic API key for access-key-to-API-key lookup
  (#16788, #17254)
* [lci] Fix extraction (#17274)
* [bbccouk] Extend id URL regular expression (#17270)
* [cwtv] Fix extraction (#17256)
* [nova] Fix extraction (#17241)
+ [generic] Add support for expressen embeds
* [raywenderlich] Adapt to site redesign (#17225)
+ [redbulltv] Add support redbull.com tv URLs (#17218)
+ [bitchute] Add support for bitchute.com (#14052)
+ [clyp] Add support for token protected media (#17184)
* [imdb] Fix extension extraction (#17167)