Log Message:
devel/ZenTest: update to 4.12.0

Update ZenTest to 4.12.0

=== 4.12.0 / 2019-09-22

* 3 major enhancements:

  * Deleted autotest from project. Use minitest-autotest instead.
  * Removed multiruby_setup. Use ruby-install or ruby-build or install your own.
  * Update multiruby to use ~/.rubies (default for ruby-install).

* 4 minor enhancements:

  * Find and use the multiruby next to multigem.
  * multiruby ignores GEM_HOME and GEM_PATH (to allow multigem to work).
  * multiruby respects global `multiruby_skip` entries in `~/.hoerc`.
  * multiruby sorts versions properly so glob ordering is consistent.

* 1 bug fix:

  * Removed hacks for rbx because nobody uses rbx.