Add missing changelog entry

Author: valscion

CHANGELOG.md

@@ -15,6 +15,9 @@ _Note: Gaps between patch versions are faulty, broken or test releases._
 * **Bug Fix**
   * fix `.cjs` files not being handled ([#512](https://github.com/webpack-contrib/webpack-bundle-analyzer/pull/512) by [@Rush](https://github.com/Rush))
 
+* **Internal**
+  * Remove `is-plain-object` ([#627](https://github.com/webpack-contrib/webpack-bundle-analyzer/pull/627) by [@SukkaW](https://github.com/SukkaW))
+
 ## 4.10.1
 
 * **Bug Fix**