models: cards: add members PUT entry point
models: cards: add members PUT entry point

Allows to change the members from the API

libreboard/libreboard,GhassenRjab/wekan,wekan/wekan,wekan/wekan,wekan/wekan,GhassenRjab/wekan,wekan/wekan,wekan/wekan,GhassenRjab/wekan,libreboard/libreboard