Log Message:
youtube-dl: Update net/youtube-dl to 20180804

Changes:
2018.08.04
----------
Extractors
* [funk:channel] Improve byChannelAlias extraction (#17142)
* [twitch] Fix authentication (#17024, #17126)
* [twitch:vod] Improve URL regular expression (#17135)
* [watchbox] Fix extraction (#17107)
* [pbs] Fix extraction (#17109)
* [theplatform] Relax URL regular expression (#16181, #17097)
+ [viqeo] Add support for viqeo.tv (#17066)

2018.07.29
----------
Extractors
* [crunchyroll:playlist] Restrict URL regular expression (#17069, #17076)
+ [pornhub] Add support for subtitles (#16924, #17088)
* [ceskatelevize] Use https for API call (#16997, #16999)
* [dailymotion:playlist] Fix extraction (#16894)
* [ted] Improve extraction
* [ted] Fix extraction for videos without nativeDownloads (#16756, #17085)
* [telecinco] Fix extraction (#17080)
* [mitele] Reduce number of requests
* [rai] Return non HTTP relinker URL intact (#17055)
* [vk] Fix extraction for inline only videos (#16923)
* [streamcloud] Fix extraction (#17054)
* [facebook] Fix tahoe player extraction with authentication (#16655)
+ [puhutv] Add support for puhutv.com (#12712, #16010, #16269)