This makes it easier to distribute, and when people only take a subdir
slice of the repo (like hterm/), make sure the license is retained.

Change-Id: Ib4eec0fa809d59565ece79a4c18ee1011ac04728
Reviewed-on: https://chromium-review.googlesource.com/843827


Reviewed-by: Brandon Gilmore <varz@google.com>
Tested-by: Mike Frysinger <vapier@chromium.org>