Bump for React 17

[levigunz]

Bump for React & React Dom 17
Updating both peer dependencies and devDependencies

Can also update website to React 17 if we want to do it at the same time.

Resolves #529

[ranneyd]

@bvaughn ?

[bvaughn]

Seems fine. Unfortunately I can't actually test this change because the local test harness script no longer works.

$ yarn start

> react-window-docs@0.0.0 start /Users/bvaughn/Documents/git/react-window/website
> node scripts/start.js

Cannot destructure property 'compile' of 'compiler.hooks' as it is undefined.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! react-window-docs@0.0.0 start: `node scripts/start.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the react-window-docs@0.0.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/bvaughn/.npm/_logs/2020-10-29T19_52_04_960Z-debug.log

[bvaughn]

Doesn't seem related to this change though I guess so...

[bvaughn]

Published to NPM as 1.8.6

[levigunz]

We’ve been using the package with React 17 in production since release with no issues. As for the site, I recall that I scanned through to make sure there weren’t any event handlers that may cause issues.