/**
  * Add confirmation columns.
  *
  * @param  \Illuminate\Database\Schema\Blueprint  $table
  */
 private function addConfirmationColumns(Blueprint $table)
 {
     if (UserConfirmator::isEnabled()) {
         $table->boolean('is_confirmed')->default(0);
         $table->string('confirmation_code', UserConfirmator::getLength())->nullable();
         $table->timestamp('confirmed_at')->nullable();
     }
 }