message: Update CHANGELOG for Tendermint Client deprecation
diff: @@ -33,6 +33,12 @@ and this project adheres to
  only updated for the class `Tendermint34Client`, not for `Client`. Please
  migrate to the former.
  +### Deprecated
  +
  +- @cosmjs/tendermint-rpc: `Client` has been deprecated. Launchpad applications
  + do not need a Tendermint RPC client and Stargate applications should use
  + `Tendermint34Client`.
  +
  ## [0.24.0] - 2021-03-11
  - @cosmjs/cosmwasm: This package is now deprecated. The same functionality is
  