Update change log for 7.8.13 release.

CHANGES.md

@@ -22,7 +22,14 @@ cylc-7.9.x (which requires Python 2.7) bundles Jinja2 2.11.
 cylc-8 (master branch, Python 3 - not yet released) uses proper Python package
 management and does not bundle Jinja2.
 
-## __cylc-7.8.13 (Upcoming)__
+## __cylc-7.8.14 (Upcoming)__
+
+
+## __cylc-7.8.13 (2023-06-13)__
+
+[#5309](https://github.com/cylc/cylc-flow/pull/5309) - Cylc 8 compat for Cylc Review: 
+  - Allow Cylc Review to see all jobs with different flow nums for Cylc 8.1 workflows
+  - Warn that not all jobs for different flows will be visible for Cylc 8.0 workflows
 
 
 ## __cylc-7.8.12 (2022-09-30)__