Migration to version 13.0

[oihane]

Todo

https://github.com/OCA/maintainer-tools/wiki/Migration-to-version-13.0

Modules to migrate

• project_billing_plan
• project_phase
• project_purchase_utilities
• project_task_milestone
• project_task_milestone_billing_plan

Missing module? Check https://github.com/OCA/maintainer-tools/wiki/%5BFAQ%5D-Missing-modules-in-migration-issue-list