Future-proof this library about stickymate HOT 4 OPEN

@hirbod big thanks for your recommendations, materials and participation in the life of the project!
I keep working on it.

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Since I think you never worked with it, here a super simple setup:
https://hackernoon.com/building-and-publishing-a-module-with-typescript-and-rollup-js-faa778c85396

And here is a perfect starter lib, which help you building a esm (modern import) or umd (including <script>). CommonJS is not important, since we don't need to run this on Node I guess.
https://github.com/rollup/rollup-starter-lib

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After this is done, we could write some tests for it using JEST for example, but this should be done as a next step.
Sorry for those many comments here now. :)

I think, this library could gain a lot more attention when its published and maintained more modern.
I also would drop IE11 and EdgeHTML support and drop support for old browsers without IntersectionObserver.

Every modern setup has a IntersectionObserver polyfill. We should stop support dead old browsers.

Support for it is already good enough.
https://caniuse.com/?search=IntersectionObserver

https://caniuse.com/?search=MutationObserver

And support for flat is also enough.
https://caniuse.com/?search=.flat
https://caniuse.com/?search=.reduce
https://caniuse.com/?search=.assign

Most things, which used to be polyfilled are working for nearly everybody.

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I'll help out as soon as I have some more time :)

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