Add changelog entry

Author: valscion

CHANGELOG.md

@@ -12,6 +12,9 @@ _Note: Gaps between patch versions are faulty, broken or test releases._
 
 ## UNRELEASED
 
+* **Bug Fix**
+  * Restore `@babel/plugin-transform-class-properties` to fix HTML report ([#682](https://github.com/webpack-contrib/webpack-bundle-analyzer/pull/682) by [@valscion](https://github.com/valscion))
+
 ## 5.0.0
 
 * **Breaking Change**