[teachertube:user] fix regex
[vk] Skip georestricted ivi embed test
[wdr] fix test
[tagesschau] replace 404 test
[rai] Skip test
[youtube_truncated_url] Add support for truncated watch URLs with annotations (#3178)
[youtube:truncated_url] Move test to extractor
[niconico] Download without authentication
[niconico] Add support for channel video
[anitube] Modernize
[teachertube:user:collection] Update media regex
[teachertube] Add support for new video URL format
[youtube:search_url] Update regexes
Merge branch 'niconico-channel-video' of https://github.com/hakatashi/youtube-dl into hakatashi-niconico-channel-video
[niconico] Extract more metadata and simplify (Closes #3181)
Merge branch 'hakatashi-niconico-channel-video'
Merge pull request #3180 from hakatashi/niconico-without-authentication

[niconico] Download without authentication
[niconico] Remove unused import
Credit @hakatashi for #3181 #3182