Migration to version 16.0

[OCA-git-bot]

Todo

https://github.com/OCA/maintainer-tools/wiki/Migration-to-version-16.0

Modules to migrate

• [x] contract_membership_delegated_partner - By @carolinafernandez-tecnativa - #154
• [x] membership_delegated_partner - By @carolinafernandez-tecnativa - #153
• [x] membership_extension - By @carmenbianca - #132
• [x] membership_initial_fee - By @edlopen - #167
• [x] membership_prorate - By @bvanjeelharia - #162
• [x] membership_prorate_variable_period - By @edlopen - #168
• [ ] membership_variable_period - By @carmenbianca - #133
• [x] membership_withdrawal - By @carmenbianca - #134
• [x] website_membership_gamification - By @carolinafernandez-tecnativa - #156
• [ ] website_membership_random_orde
• [x] website_membership_random_order - By @carolinafernandez-tecnativa - #155

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