React 16/Fiber Highlights

[coleturner]

Hey Mark,

I'm recommending this repo to several friends and colleagues, and one of the questions I am hearing most frequently these days is "what does Fiber do?"

It may be worth adding a section that highlights the notable changes regarding React 16, the "upgrade path" or lack thereof, etc.

The following writeup contains some good resources to peer into the new features and changes,
https://hackernoon.com/top-resources-to-explore-react-fiber-9a2b19114520

Any of these worth adding?

Edit/resolved: For anyone looking, the section is found here:
https://github.com/markerikson/react-redux-links/blob/master/react-implementation.md