IMPORTANT: This is a protocol upgrade so you must update to be
compatible with the network.
# New Features
- bumped the protocol version
- [New signing
- pre-authorized transaction
- added `PREFERRED_UPGRADE_DATETIME` as an optional .cfg parameter.
Allows the network to better coordinate an upgrade date.
- `--signtxn` now allows you to specify network to sign for
- improved error messages
- orderbook issue
- speeds up and more reliable catchup
- small bug fixes
- stability improvements