Add changelog entry for #151

Fixes #159

Author: jordansissel

CHANGELOG.md

@@ -1,3 +1,10 @@
+## 6.2.3
+  - Bugfix: Sends are now retried until successful. Previously, failed transmissions to Kafka
+    could have been lost by the KafkaProducer library. Now we verify transmission explicitly.
+    This changes the default 'retry' from 0 to retry-forever. It was a bug that we defaulted
+    to a retry count of 0.
+    https://github.com/logstash-plugins/logstash-output-kafka/pull/151
+
 ## 6.2.2
   - bump kafka dependency to 0.11.0.0