Reduce lib size please

[JiLiZART]

https://bundlephobia.com/result?p=drag-on-drop@3.3.2

react framework has lower size

why it's matters

https://addyosmani.com/blog/performance-budgets/

Thanks for this lib!

[gnvcor]

[joachimesque]

The big increase in weight came with the 3.3.1 release, when @babel/polyfill was added. Is that library still useful @schne324?