Update CHANGES.md.
Update CHANGES.md.

Mention removing valueGenerator.

Change-Id: I7430934c43a559de51aa6221251d9894b82ac1f6

jforge/components,jforge/components,shahrzadmn/vaadin-grid,shahrzadmn/vaadin-grid,manolo/components,manolo/components,jforge/components,shahrzadmn/vaadin-grid,manolo/components,shahrzadmn/vaadin-grid