CHANGELOG.md in logstash-output-zabbix-3.0.3 vs CHANGELOG.md in logstash-output-zabbix-3.0.4

- old
+ new

@@ -1,4 +1,7 @@
+## 3.0.4
+  - Update gemspec summary
+
 ## 3.0.3
   - Fix some documentation issues
 
 ## 3.0.1
   - Relax constraint on logstash-core-plugin-api to >= 1.60 <= 2.99