cbuildbot.py: add an example --version string

BUG=chromium:307211
TEST=None

Change-Id: I743ced81312b20af13edc84725b9b1bfd210f17d
Reviewed-on: https://chromium-review.googlesource.com/173024
Reviewed-by: Aviv Keshet <akeshet@chromium.org>
Commit-Queue: Aviv Keshet <akeshet@chromium.org>
Tested-by: Aviv Keshet <akeshet@chromium.org>
1 file changed