message: Add CHANGELOG entry for blockSearch/blockSearchAll
diff: @@ -6,6 +6,12 @@ and this project adheres to
  ## [Unreleased]
  +### Added
  +
  +- @cosmjs/tendermint-rpc: `Tendermint34Client.blockSearch` and
  + `Tendermint34Client.blockSearchAll` were added to allow searching blocks in
  + Tendermint 0.34.9+ backends.
  +
  ## [0.25.3] - 2021-05-18
  ### Fixed
  