fix result of command line option "--help"

Currently "atig --help" result is here.

    $ bin/atig --help
    usage: bin/atig [opts]
    
    Options:
        -p, --port [PORT=16668]          port number to listen
        -h, --host [HOST=localhost]      host name or IP address to listen
        -l, --log LOG                    log file
            --debug                      Enable debug mode
            --tmpdir path                temporary directory path
            --memprof                    Enable memory profiler
        -c, --conf [file=~/.atig/config] atig configuration file; default is '~/.atig/config'
    $

Following when you apply this patch.

    $ bin/atig --help
    usage: bin/atig [opts]
    
    Options:
            --help                       show this help
        -v, --version                    show version
        -p, --port [PORT=16668]          port number to listen
        -h, --host [HOST=localhost]      host name or IP address to listen
        -l, --log LOG                    log file
        -d, --debug                      Enable debug mode
        -t, --tmpdir path                temporary directory path
        -m, --memprof                    Enable memory profiler
        -c, --conf [file=~/.atig/config] atig configuration file; default is '~/.atig/config'
    $