Version 4.0:
 - Python updated to 3.5.2
 - youtube-dl engine updated to 2016.09.11.1
 - Python and youtube-dl lightened to improve performance
 - Advises users to turn off Doze for arkTube
 - Download accelerator implemented with aria2c
 - Implemented proper methods for external storage(SAF/Legacy/Root)
 - Added option to disable metadata download on audio
 - Added option to download Vorbis/Opus audio
 - Added option to separate audio download directory
 - Heads-up notifications applied
 - Fixed MediaScanner not working properly
 - Fixed jpg files being left over
 - Fixed segment downloads not working properly
 - Other major bug fixes