Updated Drupal to 8.6. This goes with the following updates because it's possible...

[yaffs-website] / vendor / chi-teck / drupal-code-generator / templates / d8 / hook / block_view_BASE_BLOCK_ID_alter.twig

/**
 * Implements hook_block_view_BASE_BLOCK_ID_alter().
 */
function {{ machine_name }}_block_view_BASE_BLOCK_ID_alter(array &$build, \Drupal\Core\Block\BlockPluginInterface $block) {
  // Change the title of the specific block.
  $build['#title'] = t('New title of the block');
}