update README.md with import supported by node
update README.md with import supported by node

It describes how to import with the es modules, but they are not supported by current versions of nodeJS. It's [experimental](https://nodejs.org/api/esm.html). You can use them with babel (or another transpilator), but it is not included in the project and will add a layer of complexity. I updated the readme with the currently supported native syntax.
vymarkov/hackathon-starter,sahat/hackathon-starter,niallobrien/hackathon-starter-plus,peterblazejewicz/hackathon-starter,peterblazejewicz/hackathon-starter,peterblazejewicz/hackathon-starter,sahat/hackathon-starter,sahat/hackathon-starter,niallobrien/hackathon-starter-plus,vymarkov/hackathon-starter