CHANGELOG.md in log_toolbox-1.3.0 vs CHANGELOG.md in log_toolbox-1.3.1

@@ -4,9 +4,13 @@
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [Released] - 2019-05-21
 
+## [1.3.1] - 2019-07-30
+### Fixed
+- Missed log format on posting to logstash
+
 ## [1.3.0] - 2019-07-30
 ### Added
 - Add feature to send log to logstash at stanging and production environment
 
 ## [1.2.0] - 2019-07-24