docs: Add backers and sponsors from Open Collective (#341)
docs: Add backers and sponsors from Open Collective (#341)

This is for your open collective backers and sponsors to appear directly on your README. 
see how it'll look [here](https://github.com/apex/apex#backers)
[More info](https://github.com/opencollective/opencollective/wiki/Github-banner)

Also add badges on top.
react-dropzone/react-dropzone,ianhowe76/react-dropzone,okonet/react-dropzone,paramaggarwal/react-dropzone,kylepotts/react-dropzone,Flixow/react-dropzone,react-dropzone/react-dropzone,react-dropzone/react-dropzone