[RFC] upgrade React to v16.6.3

[aleclarson]

#225 is ready for feedback from anyone willing to try it with their project(s) in a dev environment.

It upgrades the react peer dependency to v16.6.3, which is the version used by React Native v0.58.3. Once enough feedback is given, I will submit another RFC that adds support for React hooks. 🎉

I'm particularly interested in bugs you find that were not present before the PR was applied.

It's entirely possible that you won't encounter any bugs. 😎

Getting started

1. Run npm install aleclarson/react-native-macos#alpha in your project

2. Run npm install react@16.6.3 in your project

3. Look for bugs! 🐛

I'm trying, cuz I'm trying to get chessboardjsx working, need all those dependencies. Let you know how it goes.