DOC: update CHANGELOG

CHANGELOG.md

@@ -20,6 +20,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   * Added configurable entityLayers
   * Changed name of the icon option to icon_options, because that name better
     distiguished the options from the result icon object.
+* New behavior of the "Enter" key in the query input text field: When pressed
+  when the autocompletion drop-down is open, the enter key selects an option
+  from the autocompletion (this is as it was before). But when the "Enter" key
+  is pressed, when the autocompletion drop-down is not open, the query is being
+  submitted.
 
 ### Deprecated