Remove note about old jotai from readme

Author: 11bit

README.md

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 Simple but fully functional way to persist key-value data in IndexedDb for Jotai. Analogues to [atomWithStorage](https://jotai.org/docs/utils/atom-with-storage) but when localStorage is not enough.
 
-> ⚠️ IMPORTANT: This package was initially created to experiment with [Jotai v2 API](https://jotai.org/docs/guides/migrating-to-v2-api) and currently doesn't support v1. Please open an issue if you are interested to use it with v1.
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 [Demo App](https://json-box.vercel.app/) | [Repo](https://github.com/11bit/json-box)
 
 # Features