`python -m pup` doesn't work as a cli application

[carlosperate]

With v1.0.0a17:

$ pup --help
Usage: pup [OPTIONS] COMMAND [ARGS]...

  Pluggable Micro Packager.

Options:
  --version                       Show the version and exit.
  --log-level [CRITICAL|ERROR|WARNING|WARN|INFO|DEBUG]
                                  [default: INFO]
  --help                          Show this message and exit.

Commands:
  package  Packages the GUI application in the given pip-installable source.

But there is no output with this command:

$ python -m pup --help