update changelog

Author: aaronpk

draft-ietf-oauth-v2-1.md

@@ -3931,6 +3931,16 @@ Discussions around this specification have also occurred at the OAuth Security W
 
 [[ To be removed from the final specification ]]
 
+-15
+
+* add additional context for JWT client authentication and specifically recommend RFC7523bis
+* editorial clarifications and updates
+* clarify error responses in authorization endpoint and token endpoint
+* synced language from RFC9700 for AS open redirect considerations
+* applied RFC6750 erratas 3500 and 6613
+* resolved ambiguity around repeated parameters
+
+
 -14
 
 * Editorial clarifications