missing scw instance image update

[jtherin]

It's possible to set an instance image as public, this allow any organization to use it if they know the uuid.

Command attempted

scw instance image update $UUID zone=fr-par-3 public=true

Expected Behavior

set image $UUID as public

Actual Behavior

Print help message with missing update action.

Images are backups of your instances.
You can reuse that image to restore your data or create a series of instances with a predefined configuration.

An image is a complete backup of your server including all volumes.

USAGE:
  scw instance image <command>

AVAILABLE COMMANDS:
  create      Create an instance image
  delete      Delete an instance image
  get         Get an instance image
  list        List instance images
  wait        Wait for image to reach a stable state

FLAGS:
  -h, --help   help for image

GLOBAL FLAGS:
  -c, --config string    The path to the config file
  -D, --debug            Enable debug mode
  -o, --output string    Output format: json or human, see 'scw help output' for more info (default "human")
  -p, --profile string   The config profile to use

Use "scw instance image [command] --help" for more information about a command.