feat: Upgrade the release process
BREAKING CHANGE:
Node.js 20 is the minimum supported version

Fix: Make separator prop options in TypeScript types

Fix: Add TypeScript types

Changelog: 🚀
## Breaking changes
* Remove the wrapper tag (`div` or `span`), return an array instead
* No support for React lower than 16
* No `as` and `className` props
## Bug fixes
* Fix filtering of falsy elements

Changelog: 🚀
### Breaking changes
* Node 4 and 5 are no longer supported, Node 6 is the minimal version.
## New features
Render using custom element with the new `is` prop:
```jsx
<Group is="nav">
  <a href="#">One</a>
  <a href="#">Two</a>
  <a href="#">Three</a>
</Group>
```

Fix: Use React.Children.toArray instead of manual conversion (#4)
Close #3

Fix: Update React peer dependency
I’m not sure it was working in React 0.14 anyway.

Fix: React 15.5 support

Fix: Fix warnings when using <br/> separator (#1)

Fix: Allow separator to be a component