Review CHANGELOG format

Author: wiibaa

CHANGELOG.md

@@ -1,9 +1,11 @@
-# 2.0.4
-  - Depend on logstash-core-plugin-api instead of logstash-core, removing the need to mass update plugins on major releases of logstash
-# 2.0.3
-  - New dependency requirements for logstash-core for the 5.0 release
+## 2.0.4
+ - internal,deps: Depend on logstash-core-plugin-api instead of logstash-core, removing the need to mass update plugins on major releases of logstash
+
+## 2.0.3
+ - internal,deps: New dependency requirements for logstash-core for the 5.0 release
+
 ## 2.0.0
- - Plugins were updated to follow the new shutdown semantic, this mainly allows Logstash to instruct input plugins to terminate gracefully, 
+ - internal: 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
+ - internal,deps: Dependency on logstash-core update to 2.0