Merge branch 'update-11-2-3-and-11-1-6' into 'master'

Add changelog entries for 11.2.3 and 11.1.6

See merge request gitlab-org/gitlab-ce!21425

CHANGELOG.md

@@ -4,7 +4,9 @@ entry.
 
 ## 11.2.3 (2018-08-28)
 
-- No changes.
+### Fixed (1 change)
+
+- Fixed cache invalidation issue with diff lines from 11.2.2.
 
 ## 11.2.2 (2018-08-27)
 
@@ -269,7 +271,9 @@ entry.
 
 ## 11.1.6 (2018-08-28)
 
-- No changes.
+### Fixed (1 change)
+
+- Fixed cache invalidation issue with diff lines from 11.2.2.
 
 ## 11.1.5 (2018-08-27)