I just did a fresh drush install and am now at version 8.1.15.
When i do 'drush rr' i get:
The drush command 'rr' could not be found. Run `drush cache-clear drush` to clear the commandfile cache if you have installed new extensions.
when i do that 'cache-clear drush' command it runs fine but doesn't help with rr.
Is this still available in drush 8?