Log Message:
youtube-dl: Update to 20200606

Changes:
20200606
--------
Extractors
* [tele5] Bypass geo restriction
+ [jwplatform] Add support for bypass geo restriction
* [tele5] Prefer jwplatform over nexx (#25533)
* [twitch:stream] Expect 400 and 410 HTTP errors from API
* [twitch:stream] Fix extraction (#25528)
* [twitch] Fix thumbnails extraction (#25531)
+ [twitch] Pass v5 Accept HTTP header (#25531)
* [brightcove] Fix subtitles extraction (#25540)
+ [malltv] Add support for sk.mall.tv (#25445)
* [periscope] Fix untitled broadcasts (#25482)
* [jwplatform] Improve embeds extraction (#25467)