pleiades-ansible README out of date (roles)

[paregorios]

The pleiades-ansible README says:

Install required roles:

ansible-galaxy -p roles install -r install_roles.yml

but running this command via the CLI on ansible-galaxy 2.9.10 on osx produces the following error message:

usage: ansible-galaxy role [-h] ROLE_ACTION ...
ansible-galaxy role: error: argument ROLE_ACTION: invalid choice: 'roles' (choose from 'init', 'remove', 'delete', 'list', 'search', 'import', 'setup', 'login', 'info', 'install')

Running the following command seems to work instead:

ansible-galaxy role install -r install_roles.yml