feat: refactor to react 16

[alexdriaguine]

I was thinking this package needs some love 😁 So I've updated it.

• Uses create-react-library as build system. We can create bundles for different module types, deploy examples to gh-pages via create-react-app, testing via jest, bundling via rollup and many other goodies!
• Remove external dependencies to ease-component and raf. requestAnimationFrame should not be something we have to polyfill, if users need it they can bundle their own. Also change the API so the easing function is bring your own. We provide one default and by allowing a easing prop as number => number, users can send in functions from their animation lib of choice
• Support function as child (or render prop) for more control over the value
• Bumped a major version since the changes are breaking

Some todos:

• More thourough tests. I was thinking about using react-testing-library (not sure how one would test that it really animates, ideas? 🤔 )
• Maybe some more good looking examples 😅