New features/modifications in the PHP wrapper
- API instance SMTPApi renamed to TransactionalEmailsApi
- Fixed response for getEmailCampaigns in case of no email campaign
- RedirectionUrl is now mandatory for DOI
- Sent event now included in events array for transactional webhook
- Extended statistics for A/B test results
- Added sender id parameter in sendTransactionalEmail
- Added Contact Id as additional key for contact operations