Add changeset generation instructions (#1308)

Added instructions for generating changesets after package updates.

Author: mishushakov

CLAUDE.md

@@ -2,4 +2,5 @@ Use pnpm for node and poetry for python to install and update dependencies.
 Run `pnpm run format`, `pnpm run lint` and `pnpm run typecheck` before committing changes.
 To re-generate the API client run `make codegen` in the repository root.
 Run tests on affected codepaths using `pnpm run test`.
+Generate changesets after updating packages/cli, packages/js-sdk, packages/python-sdk.
 Default credentials are stored in .env.local in the repository root or inside ~/.e2b/config.json.