Update CHANGELOG for issue 620

CHANGELOG.adoc

@@ -22,6 +22,7 @@ A release with an intentional breaking changes is marked with:
 * Changes
 ** {issue}559[#559]: Create `query-from` and `query-all-from` as replacements for `child` and `children`. Rewrite logic such that `q` parameter allows for vector syntax similar to `query` and `query-all`. Deprecate `child` and `children`. ({person}dgr[@dgr])
 ** {issue}559[#559]: Make `get-active-element` a public API. This was previously private. ({person}dgr[@dgr])
+** {issue}620[#620]: Get stricter when unwrapping elements. ({person}dgr[@dgr])
 
 * Docs
 ** {issue}559[#559]: Deprecate use of `:active` with `query` and other APIs that use `query` under the hood. ({person}dgr[@dgr])