Update changelog

Author: richard-cox

CHANGELOG.md

@@ -4,13 +4,14 @@
 
 [Full Changelog](https://github.com/cloudfoundry/stratos/compare/3.2.0...3.2.1)
 
-This release contains a number of fixes:
+**Improvements:**
+
+- Apply SSO whitelist to additional places [\#4318](https://github.com/cloudfoundry/stratos/issues/4318)
 
 **Fixes:**
 
 - User Button Misaligned [\#4316](https://github.com/cloudfoundry/stratos/issues/4316)
 
-
 ## 3.2.0
 
 [Full Changelog](https://github.com/cloudfoundry/stratos/compare/3.1.0...3.2.0)