Convert 'drush cc all' into 'drush cache-rebuild' on Drupal 8 sites.

gistfile1.txt

<?php
// Put this in ~/.drush/policy.drush.inc
function policy_drush_command_alter(&$command) {
  if (($command['command'] == 'cache-clear') && (drush_drupal_major_version() >= 8)) {
    $command['command'] = 'cache-rebuild';
    $command['command-hook'] = 'cache-rebuild';
    $command['primary function'] = FALSE;
    $command['arguments'] = array();
    drush_set_command($command);
  }
}