update changelog

Author: myk002

changelog.txt

@@ -31,7 +31,8 @@ Template for new versions:
 ## New Features
 
 ## Fixes
-- `list-agreements`: fix logic for determining age of active petitions
+- `list-agreements`: fix date math when determining petition age
+- `gui/petitions`: fix date math when determining petition age
 
 ## Misc Improvements
 - `fix/loyaltycascade`: now also breaks up brawls and other intra-fort conflicts that *look* like loyalty cascades