update changelog

CHANGELOG-EE

@@ -2,16 +2,13 @@ Please view this file on the master branch, on stable branches it's out of date.
 
 v 8.6.0 (unreleased)
   - Improve weight filter for issues
+  - [Elastic] Add elastic checker to gitlab:check
 
 v 8.5.1
   - Fix adding pages domain to projects in groups
 
 v 8.5.0
   - Fix Elasticsearch blob results linking to the wrong reference ID (Stan Hu)
-v 8.6.0(unreleased)
-  - [Elastic] Add elastic checker to gitlab:check
-
-v 8.5.0
   - Show warning when mirror repository default branch could not be updated because it has diverged from upstream.
   - More reliable wiki indexer
   - GitLab Pages gets support for custom domain and custom certificate