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

[yaffs-website] / vendor / chi-teck / drupal-code-generator / templates / d7 / hook / field_update_field.twig

/**
 * Implements hook_field_update_field().
 */
function {{ machine_name }}_field_update_field($field, $prior_field, $has_data) {
  // Reset the static value that keeps track of allowed values for list fields.
  drupal_static_reset('list_allowed_values');
}