v0.1.0 - Toggle command

New usage

$ wled help

wled v0.1.0

Usage:
wled <command> [<arguments>]

Commands:
  toggle <ip>    Toggle WLED instance power
  version        Print current version number and exit
  help           Print usage info and exit

v0.0.1 - Simple toggle

Usage: wled <IP> to toggle WLED.