message: Update CHANGELOG for secp256k1 pubkeys
diff: @@ -86,6 +86,7 @@ and this project adheres to
  `isMsgClearAdminEncodeObject` etc helpers.
  - @cosmjs/stargate: Add transfer queries codec, as well as transfer query
  methods to IBC query extension.
  +- @cosmjs/tendermint-rpc: Export `ValidatorSecp256k1Pubkey` interface.
  ### Changed
  @@ -152,6 +153,10 @@ and this project adheres to
  instead of a single `hdPath`. `DirectSecp256k1HdWallet.generate` now also
  accepts options via this interface. This adds support for multiple accounts
  from the same mnemonic to `DirectSecp256k1HdWallet`.
  +- @cosmjs/tendermint-rpc: `ValidatorPubkey` is now a union of
  + `ValidatorEd25519Pubkey` and the newly exported `ValidatorSecp256k1Pubkey`
  + interface.
  +- @cosmjs/tendermint-rpc: `decodePubkey` now supports secp256k1 public keys.
  ### Deprecated
  