Add CHANGELOG entry for v31.2.5

Signed-off-by: Ayan Sinha Mahapatra <[email protected]>

Author: AyanSinhaMahapatra

CHANGELOG.rst

@@ -197,6 +197,18 @@ License detection:
 
   See https://github.com/nexB/scancode-toolkit/issues/3219
 
+v31.2.5 - 2023-04-21
+----------------------------------
+
+This is a minor backport release.
+
+This adds license rule changes and was requested here: 
+https://github.com/nexB/scancode-toolkit/issues/3310
+This was originally merged in #3218 and included in
+the latest release v32.x, and is also being backported
+now to v31.2.x
+
+
 v31.2.4 - 2023-01-09
 ----------------------------------