New Function Cms::custom_settings added to get custom settings
composer require "arsl/optima-class":"dev-master"
Properties class use optima\models\Properties;
Dropdowns data class use optima\models\Dropdowns;
You must update version no. in current repo otherwise changes will not be reflected in packagist.org , it means on composer update changes would not be detected.
after commiting the new changes you can go to release tab and draft new relase in order to reflect on packagist.org