Can not download playlist on Youku

[PannenkoekenNL]

• I've verified and I assure that I'm running youtube-dl 2018.01.18
• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones
• Bug report (encountered problems with youtube-dl)

If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

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 here. It should look similar to one below (replace it with your log inserted between triple ```):

youtube-dl https://list.youku.com/albumlist/show/id_4405574.html?spm=a2h0j.8191423.module_basic_info.5~5!2~5~5~5~5~A -v
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['https://list.youku.com/albumlist/show/id_4405574.html?spm=a2h0j.8191423.module_basic_info.5~5!2~5~5~5~5~A', '-v']
[debug] Encodings: locale cp1252, fs mbcs, out cp850, pref cp1252
[debug] youtube-dl version 2018.01.18
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.16299
[debug] exe versions: ffmpeg N-81741-g1212e34, ffprobe N-81741-g1212e34, rtmpdump 2.3
[debug] Proxy map: {}
[generic] id_4405574.html?spm=a2h0j.8191423.module_basic_info: Requesting header
WARNING: Falling back on generic information extractor.
[generic] id_4405574.html?spm=a2h0j.8191423.module_basic_info: Downloading webpage
[generic] id_4405574.html?spm=a2h0j.8191423.module_basic_info: Extracting information
ERROR: Unsupported URL: https://list.youku.com/albumlist/show/id_4405574.html?spm=a2h0j.8191423.module_basic_info.5~5!2~5~5~5~5~A
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpun_444l4\build\youtube_dl\YoutubeDL.py", line 784, in extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpun_444l4\build\youtube_dl\extractor\common.py", line 438, in extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpun_444l4\build\youtube_dl\extractor\generic.py", line 3086, in _real_extract
youtube_dl.utils.UnsupportedError: Unsupported URL: https://list.youku.com/albumlist/show/id_4405574.html?spm=a2h0j.8191423.module_basic_info.5~5!2~5~5~5~5~A

If the purpose of this issue is a site support request please provide all kinds of example URLs support for which should be included (replace following example URLs by yours):

• Playlist: https://list.youku.com/albumlist/show/id_4405574.html?spm=a2h0j.8191423.module_basic_info.5~5!2~5~5~5~5~A

Description of your issue, suggested solution and other information

Downloading of Youku playlists doesn't work.