message: Update CHANGELOG for Node.js v10 removal
diff: @@ -24,6 +24,7 @@ and this project adheres to
  ### Removed
  +- Node.js v10 is no longer supported. Please use v12 or later.
  - @cosmjs/tendermint-rpc: `Client` has been removed. Please use
  `Tendermint33Client` or `Tendermint34Client`, depending on your needs.
  