chore(*): update the changelog

Author: ddincheva

CHANGELOG.md

@@ -21,6 +21,7 @@ All notable changes for each version of this project will be documented in this
 ### New Features
 - `IgxGrid`, `IgxTreeGrid`, `IgxHierarchicalGrid`
     - Introduced `showSummaryOnCollapse` grid property which allows you to control whether the summary row stays visible when the groupBy / parent row is collapsed.
+    - Added support for tooltips on data cells default template and summary cells.
 - `IgxGridState` directive
     - Added support for expansion states, column selection and row pinning.
     - Added support for `IgxTreeGrid` and `IgxHierarchicalGrid` (including child grids)