message: Add CHANGELOG for node 18 [ci skip]
diff: @@ -9,6 +9,7 @@ and this project adheres to
  ### Changed
  - all: The TypeScript compilation target is now ES2020 ([#1002]).
  +- all: Add full support for Node.js 18 and run all CI tests with it ([#1240]).
  - @cosmjs/tendermint-rpc: Remove unused `index` field from `RpcTxEvent` and
  `TxEvent`. This is unset starting with Tendermint 0.34.
  - @cosmjs/crypto: The pbkdf2 implementation for old Node.js versions
  @@ -18,6 +19,7 @@ and this project adheres to
  [#1002]: https://github.com/cosmos/cosmjs/issues/1002
  [#1341]: https://github.com/cosmos/cosmjs/issues/1341
  +[#1240]: https://github.com/cosmos/cosmjs/pull/1240
  ## [0.29.5] - 2022-12-07
  