snap version shows help for no commands

[krsch]

After install travis-worker from snap:

$ sudo snap install travis-worker --edge
travis-worker (edge) v6.2.16+git21.cd59585 from Travis CI✓ installed

I try to get help:

$ travis-worker help
NAME:
   travis-worker - Travis Worker

USAGE:
   travis-worker [global options] command [command options] [arguments...]

VERSION:
   ?

AUTHOR:
   Travis CI GmbH <contact+travis-worker@travis-ci.com>

COMMANDS:
     help, h  Shows a list of commands or help for one command

GLOBAL OPTIONS:
...

The only command that is listed is help itself. Where do I find the documentation?