v0.3.0

This version includes a whole raft of dependency updates thanks to @greysteil and @dependabot-bot. There are a few other minor but important bug fixes including #202.

I've made this a minor version bump mostly because of the potential for issues during the upgrade process. Basically every single one of the dependencies (including Ruby) have been bumped. I'm optimistic that everything will go smoothly, but be warned that there is higher than usual potential for issues during upgrade.