Update changelog (#3944)

* chore: Update changelog for 0.14.2 release

CHANGELOG.md

@@ -21,7 +21,10 @@ Canonical reference for changes, improvements, and bugfixes for Boundary.
   the ID are passed through to the type-specific subcommand. Once the ID has
   been entered, autocomplete is also supported.
 
-## 0.14.2 (Not Yet Released)
+## 0.14.2 (2023/11/2)
+
+### New and Improved
+* Expose Valid Principals for Vault SSH Signed Certs: Allow users to add additional valid principals when creating a vault ssh signed cert credential library ([PR](https://github.com/hashicorp/boundary/pull/3791)).
 
 ### Bug Fixes