Update changelog.

CHANGELOG.md

@@ -1,5 +1,17 @@
 # @digitalbazaar/oid4-client Changelog
 
+## 3.1.0 - 2023-10-dd
+
+### Added
+- Add basic OID4VP support. There are many differences in OID4VP
+  implementations in the ecosystem today and OID4VP is still in
+  draft form. This implementation supports a profile of draft 20
+  that uses LDP / Data Integrity secured VCs and provides utility
+  functions for converting a subset of VPRs to authorization
+  requests and vice versa. This OID4VP implementation should be
+  considered experimental as the ecosystem matures and changes
+  are made.
+
 ## 3.0.1 - 2023-08-09
 
 ### Fixed
@@ -22,4 +34,4 @@
 ### Added
 - Initial release, see individual commits for history. Notably,
   no version 1.x was released under this name, instead it was
-  released as `@digitalbazaar/oidc4vci-client`.
+  released as `@digitalbazaar/oidc4vci-client`.