v0.3.1 Hotfix

What's Changed

We removed polyfill.io, a third-party service that has been recently compromised to serve malware. For more details, see: https://dev.to/snyk/polyfill-supply-chain-attack-embeds-malware-in-javascript-cdn-assets-55d6.

If you are unable to upgrade to v0.3.1, the good news is that Mavo only used this service for features that are currently supported everywhere, and any requests to it were gated behind our own local feature testing, so the impact should be minimal.