update version to 2.5.4 for new release
update version to 2.5.4 for new release

Maikel-Koek/magento,Adyen/adyen-magento,Adyen/magento,Maikel-Koek/magento,Maikel-Koek/magento,Adyen/adyen-magento,Adyen/magento,Adyen/adyen-magento,Adyen/magento