[Snek] [keith-packard/snek] 75648d: Update README

[Keith Packard]

  Branch: refs/heads/master
  Home:   https://github.com/keith-packard/snek
  Commit: 75648d1a24a0b0bdf4352931001dd44452cac17f
      https://github.com/keith-packard/snek/commit/75648d1a24a0b0bdf4352931001dd44452cac17f
  Author: Keith Packard <keithp at keithp.com>
  Date:   2019-03-02 (Sat, 02 Mar 2019)

  Changed paths:
    M README.md

  Log Message:
  -----------
  Update README

Note recent changes, provide debian package instructions

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