Custom scope

[nikcorg]

this is the meat of the change made by @jgwmaxwell to this fork. let's keep our local master up to date with upstream and rebase this PR (without actually merging) to keep updates manageable.

DON'T MERGE THIS PR!

To update our fork, follow these steps:

1. clone this repo
2. add upstream as remote
3. fetch upstream
4. reset this repo's main to the upstream main
5. force push the updated main to origin
6. rebase this PR onto the most recent upstream tag
7. tag the new commit with the most recent upstream tag and append -mg, e.g. v1.0.32-mg

or in commands

git clone [email protected]:musicglue/pow.git && cd pow && \
git remote add upstream https://github.com/danschultzer/pow.git && \
git fetch --all && git reset --hard upstream/master && git push --force origin main && \
git checkout feat/custom-scope-opts && git rebase <most recent upstream tag>
git tag <most recent upstream tag>-mg
git push --force --tags origin feat/custom-scope-opts