Nakama 2.1.1 release.

Author: novabyte

CHANGELOG.md

@@ -3,7 +3,7 @@ All notable changes to this project are documented below.
 
 The format is based on [keep a changelog](http://keepachangelog.com) and this project uses [semantic versioning](http://semver.org).
 
-## [Unreleased]
+## [2.1.1] - 2018-10-21
 ### Added
 - More flexible query-based filter when listing realtime multiplayer matches.
 - Runtime function to batch get groups by group ID.
@@ -18,7 +18,7 @@ The format is based on [keep a changelog](http://keepachangelog.com) and this pr
 - Use leaderboard expires rather than end active IDs with leaderboard resets.
 - Better validation of tournament duration when a reset schedule is set.
 - Set default matchmaker input query if none supplied with the request.
-- Removed a potential race condition when session ping backoff triggers alongside a timed ping.
+- Removed a possible race condition when session ping backoff triggers concurrently with a timed ping.
 - Errors returned by InitModule hooks from Go runtime plugins will now correctly halt startup.
 
 ## [2.1.0] - 2018-10-08