Fix for #85
Fix for #85

The regex required a space after the second " of url=
This works in this case:
<enclosure url="https://some.mp3" length="61828556" type="audio/mpeg" />
But not in this case:
<enclosure length="4960768" type="audio/mpeg" url="https://some.mp3"/>
MiczFlor/RPi-Jukebox-RFID,MiczFlor/RPi-Jukebox-RFID,MiczFlor/RPi-Jukebox-RFID,MiczFlor/RPi-Jukebox-RFID,MiczFlor/RPi-Jukebox-RFID