update readme file
update readme file

adeelq/dotmailer-magento2-extension,adeelq/dotmailer-magento2-extension,cdiacon/dotmailer-magento2-extension,dotmailer/dotmailer-magento2-extension,cdiacon/dotmailer-magento2-extension,dotmailer/dotmailer-magento2-extension,adeelq/dotmailer-magento2-extension,dotmailer/dotmailer-magento2-extension,cdiacon/dotmailer-magento2-extension