$ wandbox help
usage: wandbox help [-h] subcommand{list,compiler,lang,option,permlink,run}
wandbox help: error: the following arguments are required: subcommand
$ wandbox help permlink
usage: wandbox permlink [-h] id
get permlink
positional arguments:
id permlink id
optional arguments:
-h, --help show this help message and exit
fixed: #3