[NonGNU ELPA] Rubocop version 0.6.0

[ELPA update]

Version 0.6.0 of package Rubocop has just been released in NonGNU ELPA.
You can now find it in M-x list-packages RET.

Rubocop describes itself as:

  ==============================
  An Emacs interface for RuboCop
  ==============================

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

## Summary:

  This library allows the user to easily invoke RuboCop to get feedback
  about stylistic issues in Ruby code.  It also gives access to RuboCop

## Recent NEWS:

[Not provided 🙁]