Log Message:
youtube-dl: Update to 20190813

Changes:
20190813
--------
Core
* [downloader/fragment] Fix ETA calculation of resumed download (#21992)
* [YoutubeDL] Check annotations availability (#18582)

Extractors
* [youtube:playlist] Improve flat extraction (#21927)
* [youtube] Fix annotations extraction (#22045)
+ [discovery] Extract series meta field (#21808)
* [youtube] Improve error detection (#16445)
* [vimeo] Fix album extraction (#1933, #15704, #15855, #18967, #21986)
+ [roosterteeth] Add support for watch URLs
* [discovery] Limit video data by show slug (#21980)