Consider to support free Coursera videos

[valioDOTch]

Make sure you are using the latest version:

• I've verified and I assure that I'm running youtube-dl 2018.02.11

Before submitting an issue make sure you have:

• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones
• Checked that provided video/audio/playlist URLs (if any) are alive and playable in a browser

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

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The purpose of this issue is a site support request, thus I provide the full verbose output as follows:

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'https://www.coursera.org/learn/prototyping-design/lecture/iwUYF/case-example-googles-material-design']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2018.02.11
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.16299
[debug] exe versions: none
[debug] Proxy map: {}
[generic] case-example-googles-material-design: Requesting header
WARNING: Falling back on generic information extractor.
[generic] case-example-googles-material-design: Downloading webpage
[generic] case-example-googles-material-design: Extracting information
ERROR: Unsupported URL: https://www.coursera.org/learn/prototyping-design/lecture/iwUYF/case-example-googles-material-design
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpy028tx8p\build\youtube_dl\YoutubeDL.py", line 785, in extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpy028tx8p\build\youtube_dl\extractor\common.py", line 440, in extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpy028tx8p\build\youtube_dl\extractor\generic.py", line 3111, in _real_extract
youtube_dl.utils.UnsupportedError: Unsupported URL: https://www.coursera.org/learn/prototyping-design/lecture/iwUYF/case-example-googles-material-design
<end of log>

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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):

• Single video: https://www.coursera.org/learn/prototyping-design/lecture/iwUYF/case-example-googles-material-design

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Description of your issue, suggested solution and other information

Coursera offers courses that are entirely free and require no login, e.g. this one about Material Design
https://www.coursera.org/learn/prototyping-design/lecture/iwUYF/case-example-googles-material-design

There have been similar requests for Coursera (e.g. see #330), but they seem all be about courses that require login details or been closed as duplicate or outdated.

I thought that a support of these kinds of videos might be simpler, which is why I opened a new ticket.