RFS (Update): pigment/0.5.6-1 -- Get color palettes from images

Hey team.

 I have updated pigment[1] package from 0.5.5-1 to 0.5.6-1 in Salsa[2].
 It just need tagging for unstable and upload.

 Thank you.

 [1](https://github.com/Jeffser/Pigment)
 [2](https://salsa.debian.org/gnome-team/extras/pigment)

 --
 Danial Behzadi