message: Update storage-plus links in README.md
diff: @@ -53,12 +53,14 @@ This code is compiled into Wasm bytecode as part of the smart contract.
  build a smart contract.
  - [cosmwasm-storage](https://github.com/CosmWasm/cosmwasm/tree/main/packages/storage) -
  A crate in this workspace. This optional addition to `cosmwasm-std` includes
  - convenience helpers for interacting with storage.
  -- [cw-storage-plus](https://github.com/CosmWasm/cosmwasm-plus/tree/main/packages/storage-plus) -
  - A crate in `cosmwasm-plus`, which fills the same role as `cosmwasm-storage`,
  - but with much more powerful types supporting composite primary keys, secondary
  - indexes, automatic snapshotting, and more. This is newer and a bit less stable
  - than `cosmwasm-storage` but used in most modern contracts.
  + convenience helpers for interacting with storage. **This is being deprecated
  + in favor of
  + [`cw-storage-plus`](https://github.com/CosmWasm/cw-storage-plus).**
  +- [cw-storage-plus](https://github.com/CosmWasm/cw-storage-plus) - A crate which
  + fills the same role as `cosmwasm-storage`, but with much more powerful types
  + supporting composite primary keys, secondary indexes, automatic snapshotting,
  + and more. This is used in most modern contracts and likely going to be
  + stabilized (version `1.0.0`) soon.
  **Building contracts:**
  