Add entry about v3bwfile refactor

CHANGELOG.md

@@ -28,6 +28,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
   - Remove obsolete ``sbws init`` from `DEPLOY`.
   - Point to config documentation.
   - Add, unify and reuse terms in `glossary`.
+- refactor v3bwfile (#27386): move scaling method inside class
 
 ## [0.7.0] - 2018-08-09