update changelog1

CHANGELOG

@@ -14,8 +14,14 @@ v 7.14.0 (unreleased)
   - Fix bug causing "Remove source-branch" option not to work for merge requests from the same project.
 
 v 7.13.1
-  - Revert issue caching
-  - Reverted cache for events
+  - Fix: Label modifications are not reflected in existing notes and in the issue list
+  - Fix: Label not shown in the Issue list, although it's set through web interface
+  - Fix: Group/project references are linked incorrectly
+  - Improve documentation
+  - Fix of migration: Check if session_expire_delay column exists before adding the column
+  - Fix: ActionView::Template::Error
+  - Fix: "Create Merge Request" isn't always shown in event for newly pushed branch
+  - Fix bug causing "Remove source-branch" option not to work for merge requests from the same project.
 
 v 7.13.0 (unreleased)
   - Remove repository graph log to fix slow cache updates after push event (Stan Hu)