copilot: Document changes in CHANGELOG. Refs #590.

Author: estherdconrad

copilot/CHANGELOG

@@ -1,5 +1,6 @@
-2025-01-30
+2025-01-31
         * Include missing dependencies in installation instructions. (#591)
+        * Update version of GHC in README. (#590)
 
 2025-01-07
         * Version bump (4.2). (#577)