Update changelog for 0.23.0 release (#550)

CHANGELOG.md

@@ -1,16 +1,25 @@
-## 0.22.3 (Unreleased)
+## 0.23.1 (Unreleased)
+
+## 0.23.0 (April 30, 2019)
 
 ### Supported Kubernetes versions
 
 - v1.14.x
 - v1.13.x
 - v1.12.x
 
-### Major changes
+### Important
 
--   None
+This release fixes a longstanding issue with the provider namespace flag. Previously, this
+flag was erroneously ignored, but will now cause any resources using this provider to be
+created in the specified namespace. **This may cause resources to be recreated!** Unset the
+namespace parameter to avoid this behavior. Also note that this parameter takes precedence
+over any namespace defined on the underlying resource.
 
-### Improvements
+The Python SDK now supports YAML manifests and Helm charts, including `CustomResourceDefinitions`
+and `CustomResources`!
+
+### Major changes
 
 -   Put all resources in specified provider namespace (https://github.com/pulumi/pulumi-kubernetes/pull/538)
 -   Add Helm support to Python SDK (https://github.com/pulumi/pulumi-kubernetes/pull/544)