changelog entry

Author: bmatthieu3

CHANGELOG.md

@@ -25,6 +25,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - observe `_is_loaded` trait to call the Aladin API when the javascript is loaded [#149]
 - `target`, `rotation`, and `fov` can be set with astropy objects at Aladin
   initialization [#154]
+- Overlays are displayed on the generated HTML static file because it is passed with
+  traitlets instead of being sent with events. This fixes documentation examples [#151].
+- projection change through the UI now change the value of the `projection` traitlet [#151].
 
 ## [0.6.0]