File suffix is (u'mp4',) for Vimeo downloads

[slhck]

I'm downloading a file from Vimeo, and the file suffix is .(u'mp4',). It should simply be .mp4.

$ youtube-dl -v https://vimeo.com/137531269
[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'-v', u'https://vimeo.com/137531269']
[debug] Encodings: locale cp1252, fs mbcs, out None, pref cp1252
[debug] youtube-dl version 2016.01.15
[debug] Python version 2.7.10 - Windows-7-6.1.7601-SP1
[debug] exe versions: ffmpeg N-74286-ge5774f2, ffprobe N-74286-ge5774f2
[debug] Proxy map: {}
[vimeo] 137531269: Downloading webpage
[vimeo] 137531269: Extracting information
[vimeo] 137531269: Downloading webpage
[vimeo] 137531269: Downloading JSON metadata
[vimeo] 137531269: Checking Original video URL
[vimeo] 137531269: Downloading m3u8 information
[debug] Invoking downloader on u'https://vimeo.com/137531269/download?t=1453368147&v=409014815&s=c9e712a84564efc6ee00c69bb94ae13dfbefe97f57f5e0917b3a2a77c02086f0'
[download] Destination: Wire Cutters-137531269.(u'mp4',)
...

[jaimeMF]

Fixed, thanks for the report!