CHANGELOG.md in statsd-instrument-3.2.1 vs CHANGELOG.md in statsd-instrument-3.3.0

@@ -4,10 +4,18 @@
 creating a pull request, please add an entry to the "unreleased changes"
 section below.
 
 ### Unreleased changes
 
-_Nothing yet_
+## Version 3.3.0
+
+- UDP Batching now has a max queue size and emitter threads will block if the queue
+  reaches the limit. This is to prevent the queue from growing unbounded.
+  More generally the UDP batching mode was optimized to improve throughput and to
+  flush the queue more eagerly (#309).
+- Added `STATSD_BUFFER_CAPACITY` configuration.
+- Added `STATSD_MAX_PACKET_SIZE` configuration.
+- Require `set` explicitly, to avoid breaking tests for users of this library (#311)
 
 ## Version 3.2.1
 
 - Fix a bug in UDP batching that could cause the Ruby process to be stuck on exit (#291).