CHANGELOG.md in logstash-output-graphite-3.1.2 vs CHANGELOG.md in logstash-output-graphite-3.1.3

@@ -1,4 +1,7 @@
+## 3.1.3
+  - Fix some documentation issues
+
 ## 3.1.1
   - Relax constraint on logstash-core-plugin-api to >= 1.60 <= 2.99
 
 ## 3.1.0
  - breaking,config: Remove deprecated config `debug`.
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