Log Message:
graphics/wallust: update to 3.0.0nb1

This is actually an update from 3.0.0-alpha to 3.0.0-beta.
Unfortunately, I made a mistake on the previous update and pushed it as 3.0.0
instead of 3.0.0-alpha as it should have been.

new major pre-release version: 3.0.0-beta
 - update deps, man pages, completions, readme, v3.md
 - output of image is now the basename
 - wallust doesn't require a config file, because of this, the default
 - config file has been simplify to what most people would 'expect',
 - avoiding advance configuration.
 - fix a cache bug (bdd133771d)
 - make some common cli flags globals. (aa7c7af753)
 - new -N/--no-config global flag
 - template:
    * add colors array (906ce4b1f8)
    * HEXA representation of colors (e48c376984) #41
    * avoid UNC windows paths (53efe6ea92) #42
 - overall MASSIVE changes to the code => instead of implementing some
 - functionality manualy, I'm using the palette crate which is very refined and \ 
displays much better results.

REAKING:
 - rename generation to fallback_generator (a9548c24a8)
 - rename --config-path to --config-file (735bd3861b