[NonGNU ELPA] Crux version 0.4.0

[ELPA update]

Version 0.4.0 of package Crux has just been released in NonGNU ELPA.
You can now find it in M-x package-list RET.

Crux describes itself as:
  A Collection of Ridiculously Useful eXtensions

More at https://elpa.nongnu.org/nongnu/crux.html