Is --overrides an accepted option in drush 8.x? I'm creating a build script and would like to include the --overrides flag as describe in the documentation. I'm using Drupal 8.0.0 and Drush 8.0.1 and I get the following:

drush make build.make.yml ~/Sites/built --prepare-install --overrides=dev.make --no-cache -y -vvv
Unknown option: --overrides.  See 'drush help make' for available options. To suppress this error, add the option --strict=0.

Am I missing something? Is this functionality not built yet?
It appears to be in the master branch, but not yet in 8.0.x.