Log Message:
youtube-dl: Update net/youtube-dl to 20181203

Changes:
2018.12.03
----------
Core
* [utils] Fix random_birthday to generate existing dates only (#18284)

Extractors
+ [tiktok] Add support for tiktok.com (#18108, #18135)
* [pornhub] Use actual URL host for requests (#18359)
* [lynda] Fix authentication (#18158, #18217)
* [gfycat] Update API endpoint (#18333, #18343)
+ [hotstar] Add support for alternative app state layout (#18320)
* [azmedien] Fix extraction (#18334, #18336)
+ [vimeo] Add support for VHX (Vimeo OTT) (#14835)
* [joj] Fix extraction (#18280, #18281)
+ [wistia] Add support for fast.wistia.com (#18287)