feat: support multiple tags at the same commit

[caarlos0]

closes #37

using git tag --sort=-version:refname with --merged as well if current-branch mode... matching is done using a glob library because git tag don't have that option.

on a test repo, it seemed to yield same results

e.g.

svu n --strip-prefix --prefix foo/ --pattern 'foo/*'

tests were still passing, changed them a bit to test multiple tag against the same commit as well

[fatih]

Looks good to me 👍🏼