React 17 Support with npm 8

This currently works well with React 17 but it cannot be installed using npm 8 because the peer dependencies do not support React 17.

Solution: change the peer dependencies to the following.

```
  "peerDependencies": {
    "react": ">=16",
    "react-dom": ">=16"
  },
```

I can make this change if you'll accept a PR.