Update changelog for v31.0.0

Signed-off-by: Philippe Ombredanne <pombredanne@nexb.com>

Author: pombredanne

CHANGELOG.rst

@@ -4,13 +4,8 @@ Release notes
 Version (next)
 ------------------------------
 
-- Add ``posix_only`` option to ``commoncode.paths.portable_filename`` and
-  ``commoncode.paths.safe_path``. This option prevents
-  ``commoncode.paths.portable_filename`` and ``commoncode.paths.safe_path`` from
-  replacing filenames and punctuation in filenames that are valid on POSIX
-  operating systems, but not Windows.
 
-Version 31.0.0 - (2022-05-16)
+Version 31.0.0 - (2022-08-24)
 ------------------------------
 
 This is a major version with API-breaking changes in the resource module.
@@ -88,6 +83,14 @@ Other changes:
   The returned directory has a trailing path separator unless with_trail is False.
   The default is True and the default behaviour is unchanged.
 
+- Add ``posix_only`` option to ``commoncode.paths.portable_filename`` and
+  ``commoncode.paths.safe_path``. This option prevents
+  ``commoncode.paths.portable_filename`` and ``commoncode.paths.safe_path`` from
+  replacing filenames and punctuation in filenames that are valid on POSIX
+  operating systems, but not Windows.
+
+- Remove unused intbitset dependency.
+
 
 Version 30.2.0 - (2022-05-02)
 ------------------------------