[Snek] [keith-packard/snek] 2e0960: Note additional build dependencies

[Keith Packard]

  Branch: refs/heads/complete-build-deps
  Home:   https://github.com/keith-packard/snek
  Commit: 2e09601936a4e31e47da94c3eeac9cb6177f526a
      https://github.com/keith-packard/snek/commit/2e09601936a4e31e47da94c3eeac9cb6177f526a
  Author: Keith Packard <keithp at keithp.com>
  Date:   2022-12-14 (Wed, 14 Dec 2022)

  Changed paths:
    M README.md

  Log Message:
  -----------
  Note additional build dependencies

Snek uses gcc-arm-linux-gnueabi to build images for the Lego EV3 and
all of the docs are built with asciidoctor.

Signed-off-by: Keith Packard <keithp at keithp.com>