⚛️ Upgrade to React@17

[germain-gg]

React 17 was released in October 2020, this pull request updates to this new major version

The reason for the upgrade is mostly to do with performance, especially around event delegation

However, for most events, React doesn’t actually attach them to the DOM nodes on which you declare them. Instead, React attaches one handler per event type directly at the document node. This is called event delegation. In addition to its performance benefits on large application trees, it also makes it easier to add new features like replaying events.

Summary of dependency changes

Name	Old version	New version
react	16.14.0	17.0.2
react-dom	16.14.0	17.0.2
react-test-renderer	16.14.0	17.0.2
enzyme-adapter-react-16	1.15.6	🔥
@wojtekmaj/enzyme-adapter-react-17	-	0.6.1

[dbkr]

Cautious 🎉