Description of the problem, including code/CLI snippet

I am looking to use gitlab CLI to add Slack Notifications to my projects. I am unable to do so as there are no options available on the CLI to specify channel, url etc

Expected Behavior

I can pass the necessary parameters on the command line to allow me to set channels, webhook, username etc and have these update the specific project

Actual Behavior

The only options available on project-service update is --project-id and --id

gitlab project-service updateusage: gitlab project-service update [-h] [--sudo SUDO] --project-id                                     PROJECT_ID --id IDgitlab project-service update: error: the following arguments are required: --project-id, --id

Specifications

• python-gitlab version: 2.1.2
• API version you are using (v3/v4): v4
• Gitlab server version (or gitlab.com): gitlab.com