[UPD] addons table in README.md

README.md

@@ -23,6 +23,7 @@ addon | version | summary
 [marketing_security_group](marketing_security_group/) | 8.0.1.0.0 | Marketing extra security rules
 [mass_mailing_custom_unsubscribe](mass_mailing_custom_unsubscribe/) | 8.0.1.1.0 | Customizable unsubscription process on mass mailing emails
 [mass_mailing_statistic_extra](mass_mailing_statistic_extra/) | 8.0.1.0.0 | Mail statistics extra info
+[mass_mailing_unique](mass_mailing_unique/) | 8.0.1.0.0 | Avoids duplicate mailing lists and contacts
 [social_media_dribbble](social_media_dribbble/) | 8.0.1.0.0 | Dribbble Extension for the social media icons from the odoo core
 [social_media_tripadvisor](social_media_tripadvisor/) | 8.0.1.0.0 | Tripadvisor Extension for the social media icons from the odoo core
 [social_media_xing](social_media_xing/) | 8.0.1.0.0 | Xing Extension for the social media icons from the odoo core