youtube-dl 2018.12.09

Core

• [YoutubeDL] Keep session cookies in cookie file between runs
• [YoutubeDL] Recognize session cookies with expired set to 0 (#12929)

Extractors

• [teachable] Add support for teachable platform sites (#5451, #18150, #18272)
• [aenetworks] Add support for historyvault.com (#18460)

• [imgur] Improve gallery and album detection and extraction (#9133, #16577,
  #17223, #18404)
• [iprima] Relax URL regular expression (#18453)
• [hotstar] Fix video data extraction (#18386)
• [ard:mediathek] Fix title and description extraction (#18349, #18371)
• [xvideos] Switch to HTTPS (#18422, #18427)

• [lecturio] Add support for lecturio.com (#18405)
• [nrktv:series] Add support for extra materials

• [nrktv:season,series] Fix extraction (#17159, #17258)
• [nrktv] Relax URL regular expression (#18304, #18387)
• [yourporn] Fix extraction (#18424, #18425)
• [tbs] Fix info extraction (#18403)

• [gamespot] Add support for review URLs