Two improvements about libcompose command help

[bohai]

improvements

No.1

The command usage is not displayed for the command which has no options. Maybe this is a bug.

No.2

Many commands of libcompose support specifying some services as the command args. But this is not displayed in the command help .

Example

Current display:

root@SZX1000041895:~/sleep# libcompose-cli help create
WARN[0000] Note: This is an experimental alternate implementation of the Compose CLI (https://github.com/docker/compose)
Usage: libcompose-cli create

Should be:

root@SZX1000041895:~/sleep# ./libcompose-cli help create
WARN[0000] Note: This is an experimental alternate implementation of the Compose CLI (https://github.com/docker/compose)
Usage: libcompose-cli create [SERVICE...]

Create all services but do not start