Upgrade to latest ecstatic

[thornjad]

As of right now, ecstatic is at version 4.1.0, but we're still requiring only 3.3.0 on master. We need to make sure there are no breaking changes and upgrade, probably requiring ^4.x.x.

This will fix #461 and #512.

[iTakeshi]

We should use ecstatic >= 4.1.2 because of an audit report https://npmjs.com/advisories/830

[stefanhuber]

[Blackbaud-SteveBrush]

I'm getting No matching version found for ecstatic@^3.0.0 after a clean install?

[azhukaudev]

I'm getting No matching version found for ecstatic@^3.0.0 after a clean install?

I'm having the same issue.

[Blackbaud-SteveBrush]

Issue: #521