Log Message:
youtube-dl: update to 20171020.

version 2017.10.20

Core
* [downloader/fragment] Report warning instead of error on inconsistent
  download state
* [downloader/hls] Fix total fragments count when ad fragments exist

Extractors
* [parliamentliveuk] Fix extraction (#14524)
* [soundcloud] Update client id (#14546)
+ [servus] Add support for servus.com (#14362)
+ [unity] Add support for unity3d.com (#14528)
* [youtube] Replace youtube redirect URLs in description (#14517)
* [pbs] Restrict direct video URL regular expression (#14519)
* [drtv] Respect preference for direct HTTP formats (#14509)
+ [eporner] Add support for embed URLs (#14507)
* [arte] Capture and output error message
* [niconico] Improve uploader metadata extraction robustness (#14135)

version 2017.10.15.1

Core
* [downloader/hls] Ignore anvato ad fragments (#14496)
* [downloader/fragment] Output ad fragment count

Extractors
* [scrippsnetworks:watch] Bypass geo restriction
+ [anvato] Add ability to bypass geo restriction
* [redditr] Fix extraction for URLs with query (#14495)

version 2017.10.15

Core
+ [common] Add support for jwplayer youtube embeds

Extractors
* [scrippsnetworks:watch] Fix extraction (#14389)
* [anvato] Process master m3u8 manifests
* [youtube] Fix relative URLs in description
* [spike] Bypass geo restriction
+ [howstuffworks] Add support for more domains
* [infoq] Fix http format downloading
+ [rtlnl] Add support for another type of embeds
+ [onionstudios] Add support for bulbs-video embeds
* [udn] Fix extraction
* [shahid] Fix extraction (#14448)
* [kaltura] Ignore Widevine encrypted video (.wvm) (#14471)
* [vh1] Fix extraction (#9613)

version 2017.10.12

Core
* [YoutubeDL] Improve _default_format_spec (#14461)

Extractors
* [steam] Fix extraction (#14067)
+ [funk] Add support for funk.net (#14464)
+ [nexx] Add support for shortcuts and relax domain id extraction
+ [voxmedia] Add support for recode.net (#14173)
+ [once] Add support for vmap URLs
+ [generic] Add support for channel9 embeds (#14469)
* [tva] Fix extraction (#14328)
+ [tubitv] Add support for new URL format (#14460)
- [afreecatv:global] Remove extractor
- [youtube:shared] Removed extractor (#14420)
+ [slideslive] Add support for slideslive.com (#2680)
+ [facebook] Support thumbnails (#14416)
* [vvvvid] Fix episode number extraction (#14456)
* [hrti:playlist] Relax URL regular expression
* [wdr] Relax media link regular expression (#14447)
* [hrti] Relax URL regular expression (#14443)
* [fox] Delegate extraction to uplynk:preplay (#14147)
+ [youtube] Add support for hooktube.com (#14437)

version 2017.10.07

Core
* [YoutubeDL] Ignore duplicates in --playlist-items
* [YoutubeDL] Fix out of range --playlist-items for iterable playlists and
  reduce code duplication (#14425)
+ [utils] Use cache in OnDemandPagedList by default
* [postprocessor/ffmpeg] Convert to opus using libopus (#14381)

Extractors
* [reddit] Sort formats (#14430)
* [lnkgo] Relax URL regular expression (#14423)
* [pornflip] Extend URL regular expression (#14405, #14406)
+ [xtube] Add support for embed URLs (#14417)
+ [xvideos] Add support for embed URLs and improve extraction (#14409)
* [beeg] Fix extraction (#14403)
* [tvn24] Relax URL regular expression (#14395)
* [nbc] Fix extraction (#13651, #13715, #14137, #14198, #14312, #14314, #14378,
  #14392, #14414, #14419, #14431)
+ [ketnet] Add support for videos without direct sources (#14377)
* [canvas] Generalize mediazone.vrt.be extractor and rework canvas and een
+ [afreecatv] Add support for adult videos (#14376)