Fix changelog.

Author: danpat

CHANGELOG.md

@@ -6,7 +6,7 @@
       - ADDED: new waypoints parameter to the `route` plugin, enabling silent waypoints [#5345](https://github.com/Project-OSRM/osrm-backend/pull/5345)
       - ADDED: data timestamp information in the response (saved in new file `.osrm.timestamp`). [#5115](https://github.com/Project-OSRM/osrm-backend/issues/5115)
     - Routing:
-      - CHANGED: allow routing past `barrier=arch` []()
+      - CHANGED: allow routing past `barrier=arch` [#5352](https://github.com/Project-OSRM/osrm-backend/pull/5352)
 
 # 5.21.0
   - Changes from 5.20.0