Add changes to SR for 2.5.3 (#2303)

* Add changes for SR 2.5.3

* Minor addition

Author: rayokota

CHANGELOG.md

@@ -1,3 +1,14 @@
+# 2.5.3
+
+v2.5.3 is a maintenance release with the following fixes and enhancements:
+
+## Fixes
+
+* Properly handle messages with well-known types in Protobuf serializer
+* Use AES128_GCM in the Local KMS client, for consistency with Java/go
+* Include deleted schemas when getting schemas by subject and version
+* Handle signed ints when transforming Protobuf payloads
+
 # 2.5.2
 
 ## Fixes