CHANGELOG.md in logstash-output-opentsdb-3.1.4 vs CHANGELOG.md in logstash-output-opentsdb-3.1.5

@@ -1,4 +1,7 @@
+## 3.1.5
+  - Docs: Set the default_codec doc attribute.
+
 ## 3.1.4
   - Update gemspec summary
 
 ## 3.1.3
   - Fix some documentation issues