Nits to take care of someday

[coolaj86]

Todos:

• docs & help: the update actually happens every 1 minute
• bump.sh should create a github release
  (the click-button output message is good enough)
• Possibly store last known local IP address (lastip)
• Force update every 24 hours?
• something better than ipify for IPv6? (i.e. only IPv6, less logic)
• webi: PR request.js to fix method HEAD changing to GET