Update change log.

CHANGES.md

@@ -31,13 +31,17 @@ used.
 [#5747](https://github.com/cylc/cylc-flow/pull/5747) - Fix a bug where Cylc
 Review was not returning the correct number of entries in the Cycles page.
 
+[#5237](https://github.com/cylc/cylc-flow/pull/5237) - 
+Cylc 8 forward-compat: allow suite-state xtriggers (and the `cylc suite-state`
+command) to read Cylc 8 databases.
+
+
 ## __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)__
 
 ### Fixes