migrated from zod v3 to zod v4

README.md

@@ -19,14 +19,18 @@ This repository is a continuation of [Gregory Bouteiller's zod-pocketbase](https
 - Removed `doc/`, `playground/` and monorepo configuration
 - Replaced `pnpm` and `node` in favor of `bun`
 - Switched `.github/` to `.gitea/` and `gh` to `tea`
+- Switched from `eslint` and `prettier` to `biome`.
 
 ### Dependencies & Code
 - Migrated from `tsup` to `tsdown`
-- Updated all npm dependencies (except `zod`, which was only updated to the latest 3 version)
+- Updated all npm dependencies
 - Removed unused dependencies
 - Fixed `getPocketbase` function in `sdk.ts` to match the latest PocketBase version
 - Implemented most TODOs left in `content.ts`
 
+### Not working (yet)
+- Expanding `Relation` field with type `Multiple` is not working for now. Try to avoid using it.
+
 ## License
 
 [MIT License](./LICENSE)