Update Box changelog

Author: nicolasfont

CHANGELOG.md

@@ -1,8 +1,15 @@
+# Upcoming
 
+## Updates
+
+- Box: move out of experimental. Experimental version is kept for backward compatibility but deprecated. Will be removed in a future release.
+- Box: rename spacing props values from "default" to "medium".
+- Box: update Box docs.
 
 # 7.1.2
 
 ## New Component
+
 - Add TopNav component
 
 # 7.1.1
@@ -41,12 +48,6 @@
 - renderToolbar's data prop now return an array of objects instead of array of arrays.
 - Before: data = [['first', 'last']], After: data = [{row: ['first', 'last'], selected: true}]
 
-## New Feature
-
-- Box: move out of experimental
-- Box: refactor props
-- Box: update docs
-
 ## New Component
 
 - Add Badge component