We don't want to stop *at* the tag at the base, we want to stop at
the *version* before that tag, which may actually be several tags back
in history.
Closes-bug: #1652092
Change-Id: I107651fce3fcb06d9f155e50ae4decd905fa932d
Signed-off-by: Doug Hellmann <doug@doughellmann.com>