resolve bg symlink to absolute path

[mrt0rtikize]

faced a problem with symlinks and wal-telegram

my files structure is like

├── wallpaper -> /home/mrt0rtikize/Pictures/wallpapers/a_girl_red_circle.jpg
└── wallpapers
   ├── a_girl_blue_sky.jpeg
   ├── a_girl_red_circle.jpg
   ├──  ...

so in my case wal-telegram doesn't work (cuz symlink has no extension) and i think it's a common case for pywal users

i think what resolving symlinks to absolute path with readlink is easiest solution:

• if bg is symlink - we will have absolute path instead
• if bg is path - it will not change

[guillaumeboehm]

Looks good

[guillaumeboehm]

Thanks for the MR