Make github-tag-version work for anyone
Make github-tag-version work for anyone

Previously the code was closely tied to you username being shared
between your local computer's account, GitHub, and your LSST email
address. This makes it possible to use the code for more people who have
mixed usernames in accounts.

For DM-4220.

lsst-sqre/sqre-codekit,lsst-sqre/sqre-codekit