Bump version 12.0.1.1.20
CHANGELOG:
## [12.0.1.1.20] - 2021-04-13
### Fixed
- [#457](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/457) Avoid error if 'firstname', 'lastname' or 'is_company' fields are not found as parameters in SubscriptionRequest creation.
- [#455](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/455) Fix default type in partner creation as "representative".