Update CHANGELOG-EE.md for 12.0.2-ee

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CHANGELOG-EE.md

 Please view this file on the master branch, on stable branches it's out of date.
 
+## 12.0.2 (2019-06-25)
+
+### Fixed (1 change)
+
+- Take into account events created before milestone start. !14184
+
+
 ## 12.0.1 (2019-06-24)
 
 - No changes.

ee/changelogs/unreleased/weimeng-burndown-chart-fix.yml

----
-title: Take into account events created before milestone start
-merge_request: 14184
-author:
-type: fixed