Add CHANGELOG to 7.9.4

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

CHANGELOG

@@ -66,6 +66,10 @@ v 7.10.0 (unreleased)
   - Fix and improve help rendering (Sullivan Sénéchal)
   - Fix final line in EmailsOnPush email diff being rendered as error.
+v 7.9.4
+  - Security: Fix project import URL regex to prevent arbitary local repos from being imported
+  - Fixed issue where only 25 commits would load in file listings
+
 v 7.9.3
   - Contains no changes
   - Add icons to Add dropdown items.