The URL of the video is not stored in the same attribute of the response
if WebTorrent is enabled or not.
It caused a bug when trying to play a video which do not use WebTorrent.
Also create a "quality" job to run pylint automatically on merge
requests. The contributing guidelines are updated with this information
and the remaining pylint violations were fixed in the code.
See merge request StCyr/plugin.video.peertube!11 for more information