message: Add release notes for version 4.49.0
diff: # BitGoJS Release Notes
  +## 4.49.0
  +### New Features
  +- Complete support for native segwit address generation and verification
  +- Ensure match between addressType and chain parameters when calling `generateAddress()`
  +- Use `@bitgo/unspents` for address chain information
  +- Add support for overriding the server extended public key used by BitGoJS
  +- Add support for new ERC 20 tokens (SLOT, ETHOS, LBA, CDAG)
  +
  +### Bug Fixes
  +- Get latest block height and transaction prebuild in parallel
  +
  +### Deprecation Notices
  +The following parameters to the `generateAddress()` function on `Wallet` objects have been deprecated, and will be removed in a future version of BitGoJS:
  +- `addressType`
  +- `segwit`
  +- `bech32`
  +
  +Instead, the address type will be determined by the `chain` parameter, with the following behavior:
  +
  +| chain | type | format | usage |
  +| ----- | ---- | ------ | -------- |
  +| 0 | pay to script hash | base58 | External |
  +| 1 | pay to script hash | base58 | Internal (change) |
  +| 10 | wrapped segwit | base58 | External |
  +| 11 | wrapped segwit | base58 | Internal (change) |
  +| 20 | native segwit | bech32 | External |
  +| 21 | native segwit | bech32 | Internal (change) |
  +
  ## 4.48.1
  ### Bug Fixes
  - Treat errors thrown from `verifySignature` as an invalid signature
  