Add specificity for the exact libraries used in jvm/CHANGELOG.md

Author: nedtwigg

jvm/CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
-All notable changes to this project will be documented in this file.
+Changelog for the selfie JVM libraries.
+
+- [`com.diffplug.selfie:selfie-lib:VERSION`](https://central.sonatype.com/artifact/com.diffplug.selfie/selfie-lib)
+- [`com.diffplug.selfie:selfie-runner-junit5:VERSION`](https://central.sonatype.com/artifact/com.diffplug.selfie/selfie-runner-junit5)
+  - can be used with JUnit4 via [junit-vintage](https://junit.org/junit5/docs/current/user-guide/#migrating-from-junit4)
 
 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).