Handle cases where youtube_url may be from other providers (e.g., music.163.com)

[billchenchina]

• Updated logic to check for the 'v' parameter in the query.
• If 'v' is not present, the full URL is printed instead.

Fixes:

$ mkchromecast -s -y 'http://music.163.com/#/song?id=2619645817'
Mkchromecast v0.3.9
The Youtube URL chosen: http://music.163.com/album/245695664/
Traceback (most recent call last):
  File "/usr/bin/mkchromecast", line 311, in <module>
    mk()
  File "/usr/bin/mkchromecast", line 59, in __init__
    self.audio_linux()
  File "/usr/bin/mkchromecast", line 92, in audio_linux
    import mkchromecast.audio
  File "/usr/lib/python3/dist-packages/mkchromecast/audio.py", line 85, in <module>
    video = query["v"][0]
            ~~~~~^^^^^
KeyError: 'v'

[billchenchina]

Or, maybe we should not parse the URL and print the v part considering https://youtu.be/{VIDEO_ID} format?