Update CHANGELOG.md for 9.2.8

[ci skip]

CHANGELOG.md

@@ -270,6 +270,13 @@ entry.
 - Remove foreigh key on ci_trigger_schedules only if it exists.
 - Allow translation of Pipeline Schedules.
 
+## 9.2.8 (2017-07-19)
+
+- Improve support for external issue references. !12485
+- Renders 404 if given project is not readable by the user on Todos dashboard.
+- Fix incorrect project authorizations.
+- Remove uploads/appearance symlink. A leftover from a previous migration.
+
 ## 9.2.7 (2017-06-21)
 
 - Reinstate is_admin flag in users api when authenticated user is an admin. !12211 (rickettm)