v1.5.3

Fixes

• --ascii (and non-UTF-8 locales): the gateway/WAN indicators on the
  Context line (o up, x down, ? unknown) and the x in the batch
  banner follow the charset; the output is now pure ASCII in that mode.

Docs

• README: a demo recording at the top and an 80-second tour of every view and
  mode at the end; the examples are real output of this version.