v0.6.0: Large cleanups, ES6 modules

This is mainly a release to clean up a bunch of issues with the code. The big changes are the inclusion of type hints in the Python API, and...

A HUGE BREAKING CHANGE

The JavaScript API is now ES6 modules only. If you really need CommonJS perhaps some accomodation can be reached. Also, Node and Web environments now get separate entry points, so less (but sadly still some) Webpack tomfoolery is necessary.

What's Changed

• Add type hints to Python API by @dhdaines in #54
• Add and use pre-commit by @dhdaines in #55
• Format all the things by @dhdaines in #56
• Switch to ES6 modules (and only ES6 modules) by @dhdaines in #57

Full Changelog: v0.5.0...v0.6.0