Nakama 2.3.0 release.

The format is based on [keep a changelog](http://keepachangelog.com) and this project uses [semantic versioning](http://semver.org).

## [Unreleased]

## [2.3.0] - 2018-12-31

### Added

- WebSocket connections can now use pure Protobuf binary messaging.

- WebSocket connections can now send Protobuf binary messages.

- Lua runtime tournament listings now return duration, end active, and end time fields.

- Lua runtime tournament end hooks now contain duration, end active, and end time fields.

- Lua runtime tournament reset hooks now contain duration, end active, and end time fields.

- Separate configuration for maximum number of concurrent join requests to authoritative matches.

- New configuration flag for maximum number of concurrent join requests to authoritative matches.

- New runtime function to kick users from a group.

- Clients sending data to an invalid match ID will now receive an uncollated error.

- Optional log file rotation.

- Clients that send data to an invalid match ID will now receive an uncollated error.

- The logger now supports optional log file rotation.

- Go runtime authoritative matches now also print Match IDs in log lines generated within the match.

- Allow client email authentication requests to optionally authenticate with username/password instead of email/password.

- Allow runtime email authentication calls to authenticate with username/password instead of email/password.

- Email authentication client requests can authenticate with username/password instead of email/password.

- Email authentication server runtime calls can authenticate with username/password instead of email/password.

- New authoritative match dispatcher function to defer message broadcasts until the end of the tick.

- New runtime function to retrieve multiple user accounts by user ID.

- Send notifications to admins of non-open groups when a user requests to join.

- Send notifications to users when their request to join a group is accepted.

- New configuration parameter for presence event buffer size.

- New configuration flag for presence event buffer size.

### Changed

- Replace standard logger supplied to the Go runtime with a more powerful interface.

- Authoritative match join attempts now wait until the handler acknowledges the join before returning to clients.

### Fixed

- Correctly report execution mode in Lua runtime after hooks.

- Report correct execution mode in Lua runtime after hooks.

- Use correct parameter type for creator ID in group update queries.

- Use correct parameter name for lang tag in group update queries.

- Do not allow users to send friend requests to the root user.