Update changelog

CHANGELOG.md

@@ -1,5 +1,26 @@
 # Changelog
 
+## openapi-common 1.5.0, 2024-02-26
+
+### New features
+
+* [Issue #495](https://github.com/ansys/openapi-common/issues/495),
+  [Pull request #497](https://github.com/ansys/openapi-common/pull/497):
+  Support optional fields during serialization.
+* [Issue #491](https://github.com/ansys/openapi-common/issues/491),
+  [Pull request #434](https://github.com/ansys/openapi-common/pull/434):
+  Add `py.typed` file to release.
+* [Issue #482](https://github.com/ansys/openapi-common/issues/482),
+  [Pull request #469](https://github.com/ansys/openapi-common/pull/469):
+  Support deserialization of partially or undefined models.
+
+### Contributors
+
+* Doug Addy (Ansys)
+* Andy Grigg (Ansys)
+* Ludovic Steinbach (Ansys)
+
+
 ## openapi-common 1.4.0, 2024-01-10
 
 ### New features
@@ -147,3 +168,14 @@
 * Andy Grigg (Ansys)
 * Ludovic Steinbach (Ansys)
 * Kathy Pippert (Ansys)
+
+
+## openapi-common 1.0.0, 2022-02-17
+
+Initial release
+
+### Contributors
+
+* Doug Addy (Ansys)
+* Andy Grigg (Ansys)
+* Kathy Pippert (Ansys)