Python-nanoid

* Fix React Native warning on `non-secure` import (by Jia Huang).

**Migration guide:** <https://github.com/ai/nanoid/releases/tag/3.0.0>
* Move to ES2016 syntax. You need to use Babel for IE 11.
* Move to named exports `import { nanoid } from 'nanoid'`.
* Move `import url from 'nanoid/url'` to `import { urlAlphabet } from 'nanoid'`.
* Replace `format()` to `customRandom()`.
* Replace `generate()` to `customAlphabet()`.
* Remove `async/format`.
* Remove React Native support for `nanoid/async`.
* Add `nanoid.js` to use directly in browser from CDN.
* Add TypeScript type definitions.
* Add ES modules support for bundlers, Node.js, and React Native.
* Fix React Native support.
* Reduce size.
* Improve docs (by Dair Aidarkhanov).

* Reduce size (by Anton Evzhakov).

* Reduce size by 10% (by Anton Khlynovskiy).

* Reduce `format` and `async/format` size (by Dair Aidarkhanov).

* Improve React docs (by Nahum Zsilva).