Nakama 3.4.0 release.

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

## [Unreleased]

## [3.4.0] - 2021-07-08

### Added

- Add new groupsList runtime function.

- Add runtime leaderboardList and leaderboardsGetId functions.

- Add leaderboard/tournament prev_reset field.

- Add custom metrics runtime functions for counters, gauges, and timers.

- Add optional override for runtime Apple IAP configuration.

- Add socket lang parameter to relevant runtime contexts.

- Add optional override for runtime Apple IAP validation function.

- Add socket lang parameter to Go runtime contexts.

### Changed

- Include ticket in party matchmaker add operation responses.

- Log recovered panics in HTTP handler functions at error level rather than info.

- Add new langTag, members and open filters to the group listing API.

- Upgrade pgx to v4 for improved SQL performance.

- Change RegisterLeaderboardReset runtime function signature.

- Update RegisterLeaderboardReset runtime function signature.

- Cancel runtime context when graceful shutdown completes.

- Add button to Nakama Console UI to allow device IDs to be copied.

### Fixed

- Ensure all members are correctly listed in party info when there are multiple concurrent successful joins.

- Correctly set party ID in matchmaker matched callback input.

- Party close messages sent as expected.

- Send Party close messages only where appropriate.

- Fix TypeScript/JavaScript match dispatcher presence list validation.

- Fix JavaScript/Lua friendsList incorrect returned values.