Complete CHANGELOG

Author: gaeljw

CHANGELOG.md

@@ -13,6 +13,10 @@ See also the [CHANGELOG](https://github.com/cucumber/cucumber-jvm/blob/master/CH
 ### Added
 
 - [Doc] Users documentation on Scala DSL
+- [Scala DSL] Support for transformers ([#32](https://github.com/cucumber/cucumber-jvm-scala/issues/32) Gaël Jourdan-Weil) 
+  - See [Transformers](docs/transformers.md)
+- [Transformers] Add optional `JacksonDefaultDataTableEntryTransformer` ([#31](https://github.com/cucumber/cucumber-jvm-scala/issues/31) Gaël Jourdan-Weil)
+  - See [here](docs/default_jackson_datatable_transformer.md)
 
 ### Changed