From: author@payflex.com
To: commits@list.com
Subject: [cbas] 2.1 tag updated. $new_commit_describe
X-Git-Refname: refs/tags/2.1
X-Git-Reftype: tag
X-Git-Oldrev: $old_commit_hash
X-Git-Newrev: $new_commit_hash

The tag, 2.1 has been updated
        to $new_commit_hash (commit)
      from $old_commit_hash (commit)

- Log -----------------------------------------------------------------
commit $new_commit_hash
Author: A U Thor <author@example.com>
Date:   $new_commit_date

    force update lightweight tag
-----------------------------------------------------------------------