Update CHANGELOG.rst

Signed-off-by: Jono Yang <jyang@nexb.com>

Author: JonoYang

CHANGELOG.rst

@@ -1,9 +1,18 @@
 Release notes
 =============
 
-Version (next)
+Version 31.0.1 - (2023-02-23)
 ------------------------------
 
+- Fix issue when instantiating a ``VirtualCodebase`` from a JSON where if there
+  is no codebase attribute with the same name in the scan, then None is assigned
+  to the codebase attribute instead of the default value that was passed in when
+  VirtualCodebase was instantiated.
+  https://github.com/nexB/commoncode/issues/48
+
+- Update spdx-tools to 0.7.0rc0
+  https://github.com/nexB/commoncode/pull/50
+
 
 Version 31.0.0 - (2022-08-24)
 ------------------------------