Update changelog.

Author: nedtwigg

jvm/CHANGELOG.md

@@ -11,6 +11,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Added
+- Added an entrypoint `Selfie.vcrTestLocator()` for the new `VcrSelfie` class for snapshotting and replaying network traffic. ([#517](https://github.com/diffplug/selfie/pull/517/files))
 ### Fixed
 - Fixed a bug when saving facets containing keys with the `]` character ([#518](https://github.com/diffplug/selfie/pull/518))