Repository: youtube-dl
Issue: [bilibili] bangumi links have changed.
Labels: geo-restricted

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## Checklist

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Carefully read and work through this check list in order to prevent the most common mistakes and misuse of youtube-dl:
- First of, make sure you are using the latest version of youtube-dl. Run `youtube-dl --version` and ensure your version is 2019.08.02. If it's not, see https://yt-dl.org/update on how to update. Issues with outdated version will be REJECTED.
- Make sure that all provided video/audio/playlist URLs (if any) are alive and playable in a browser.
- Make sure that all URLs and arguments with special characters are properly quoted or escaped as explained in http://yt-dl.org/escape.
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- [x] I'm reporting a broken site support
- [x] I've verified that I'm running youtube-dl version **2019.08.02**
- [x] I've checked that all provided URLs are alive and playable in a browser
- [x] I've checked that all URLs and arguments with special characters are properly quoted or escaped
- [x] I've searched the bugtracker for similar issues including closed ones


## Verbose log

<!--
Provide the complete verbose output of youtube-dl that clearly demonstrates the problem.
Add the `-v` flag to your command line you run youtube-dl with (`youtube-dl -v <your command line>`), copy the WHOLE output and insert it below. It should look similar to this:
 [debug] System config: []
 [debug] User config: []
 [debug] Command-line args: [u'-v', u'http://www.youtube.com/watch?v=BaW_jenozKcj']
 [debug] Encodings: locale cp1251, fs mbcs, out cp866, pref cp1251
 [debug] youtube-dl version 2019.08.02
 [debug] Python version 2.7.11 - Windows-2003Server-5.2.3790-SP2
 [debug] exe versions: ffmpeg N-75573-g1d0487f, ffprobe N-75573-g1d0487f, rtmpdump 2.4
 [debug] Proxy map: {}
 <more lines>
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```
 .\youtube-dl.exe -v https://www.bilibili.com/bangumi/play/ss5802#100643
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'https://www.bilibili.com/bangumi/play/ss5802#100643']
[debug] Encodings: locale cp936, fs mbcs, out cp936, pref cp936
[debug] youtube-dl version 2019.08.02
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.18362
[debug] exe versions: none
[debug] Proxy map: {}
[generic] ss5802#100643: Requesting header
WARNING: Falling back on generic information extractor.
[generic] ss5802#100643: Downloading webpage
[generic] ss5802#100643: Extracting information
ERROR: Unsupported URL: https://www.bilibili.com/bangumi/play/ss5802#100643
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpjwvl_v2x\build\youtube_dl\YoutubeDL.py", line 796, in extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpjwvl_v2x\build\youtube_dl\extractor\common.py", line 530, in extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpjwvl_v2x\build\youtube_dl\extractor\generic.py", line 3333, in _real_extract
youtube_dl.utils.UnsupportedError: Unsupported URL: https://www.bilibili.com/bangumi/play/ss5802#100643
```


## Description

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Now [BiliBili](https://www.bilibili.com/) redirects the link `http://bangumi.bilibili.com/anime/1869/play#40062` (which is a test in the [bilibili extractor](https://github.com/ytdl-org/youtube-dl/blob/master/youtube_dl/extractor/bilibili.py)) to `https://www.bilibili.com/bangumi/play/ss1869#40062`. A new solution is needed ?