mpkg-make-index: add --help and --version arguments.
mpkg-make-index: add --help and --version arguments.

So it displays:
$ mpkg-make-index --help
Usage: mpkg-make-index [OPTIONS] [DIRECTORY=./]

Options:
 -h or --help          Display this message.
 -v or --version       Display the version.

or:
$ mpkg-make-index --help
1.0

Signed-off-by: Gaël PORTAY <1666f60cfa201a60b0ea694168a0b6932673170a@gmail.com>

gazoo74/mpkg,gazoo74/mpkg