Update CHANGELOG.md for 8.14.7

[ci skip]

CHANGELOG.md

@@ -273,6 +273,14 @@ entry.
 - Whitelist next project names: help, ci, admin, search. !8227
 - Adds back CSS for progress-bars. !8237
 
+## 8.14.7 (2017-01-21)
+
+- Ensure export files are removed after a namespace is deleted.
+- Don't allow project guests to subscribe to merge requests through the API. (Robert Schilling)
+- Prevent users from creating notes on resources they can't access.
+- Prevent users from deleting system deploy keys via the project deploy key API.
+- Upgrade omniauth gem to 1.3.2.
+
 ## 8.14.6 (2017-01-10)
 
 - Update the gitlab-markup gem to the version 1.5.1. !8509