Update CHANGELOG.md for 8.16.9

[ci skip]

CHANGELOG.md

@@ -549,6 +549,14 @@ entry.
 - Remove deprecated GitlabCiService.
 - Requeue pending deletion projects.
 
+## 8.16.9 (2017-04-05)
+
+- Don’t show source project name when user does not have access.
+- Remove the class attribute from the whitelist for HTML generated from Markdown.
+- Fix path disclosure in project import/export.
+- Fix for open redirect vulnerability using continue[to] in URL when requesting project import status.
+- Fix for open redirect vulnerabilities in todos, issues, and MR controllers.
+
 ## 8.16.8 (2017-03-19)
 
 - Only show public emails in atom feeds.