message: Update CHANGELOG for faucet denom change
diff: - @cosmjs/faucet: Environmental variable `FAUCET_FEE` renamed to
  `FAUCET_GAS_PRICE` and now only accepts one token. Environmental variable
  `FAUCET_GAS` renamed to `FAUCET_GAS_LIMIT`.
  +- @cosmjs/faucet: `/credit` API now accepts either `denom` (base token) or as
  + before `ticker` (unit token). Environmental variables specifying credit
  + amounts now need to use uppercase denom.
  - @cosmjs/launchpad: Rename `FeeTable` type to `CosmosFeeTable` and export a new
  more generic type `FeeTable`.
  - @cosmjs/launchpad: Add new class `GasPrice`, new helper type `GasLimits` and
  