CHANGELOG.md in logstash-output-datadog-0.1.5 vs CHANGELOG.md in logstash-output-datadog-2.0.1

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+## 2.0.0
+ - Plugins were updated to follow the new shutdown semantic, this mainly allows Logstash to instruct input plugins to terminate gracefully, 
+   instead of using Thread.raise on the plugins' threads. Ref: https://github.com/elastic/logstash/pull/3895
+ - Dependency on logstash-core update to 2.0
+