[UPD] addons table in README.md

README.md

@@ -18,6 +18,7 @@ addon | version | summary
 [mail_optional_autofollow](mail_optional_autofollow/) | 9.0.1.0.0 | Choose if you want to automatically add new recipients as followers on mail.compose.message
 [mail_tracking](mail_tracking/) | 9.0.3.0.1 | Email tracking system for all mails sent
 [mail_tracking_mailgun](mail_tracking_mailgun/) | 9.0.1.0.0 | Mail tracking and Mailgun webhooks integration
+[mass_mailing_partner](mass_mailing_partner/) | 9.0.1.0.0 | Link partners with mass-mailing
 [mass_mailing_security_group](mass_mailing_security_group/) | 9.0.1.0.0 | Mass mailing security group
 
 Unported addons