Unsubscribe link now sets a flag in partner
CHANGELOG:
### CHANGED
- [#750](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/750) Unsubscribe link now sets a flag in partner
https://trello.com/c/Ke4K6Jfa/1166-gesti%C3%B3n-de-opt-out-de-listas-de-correo
Related card:Edited by Pelayo García