Run help by default

[thebeanogamer]

[root@6225da829276 build]# ractl
[root@6225da829276 build]# ractl help
ractfctl 0.1
RACTF Admins <admins@ractf.co.uk>
RACTF Admin CLI

USAGE:
    ractl [SUBCOMMAND]

FLAGS:
    -h, --help       Prints help information
    -V, --version    Prints version information

SUBCOMMANDS:
    help       Prints this message or the help of the given subcommand(s)
    install    Installs RACTF

help should run automatically in the absence of any other subcommand.