[GNU ELPA] Autocrypt version 0.4.2

[ELPA update]

Version 0.4.2 of package Autocrypt has just been released in GNU ELPA.
You can now find it in M-x list-packages RET.

Autocrypt describes itself as:

  ========================
  Autocrypt implementation
  ========================

More at https://elpa.gnu.org/packages/autocrypt.html

## Summary:

  Implementation of Autocrypt (https://autocrypt.org/) for various
  Emacs MUAs.

## Recent NEWS:

[Not provided 🙁]