Fill in changelog for 1.2.1 (#119)

Author: dpwiz

ChangeLog.md

@@ -6,7 +6,9 @@
 
 ## [1.2.1]
 
+- Added `DearImGui.Raw.DrawList` for drawing primitives.
 - Added `DearImGui.Raw.IO` with attribute setters.
+- Added `DearImGui.Raw.ListClipper` for efficient list viewports.
 
 ## [1.2.0]
 
@@ -44,4 +46,6 @@ Initial Hackage release based on 1.83.
 [1.0.2]: https://github.com/haskell-game/dear-imgui.hs/tree/v1.0.2
 [1.1.0]: https://github.com/haskell-game/dear-imgui.hs/tree/v1.1.0
 [1.2.0]: https://github.com/haskell-game/dear-imgui.hs/tree/v1.2.0
+[1.2.1]: https://github.com/haskell-game/dear-imgui.hs/tree/v1.2.1
+[1.2.2]: https://github.com/haskell-game/dear-imgui.hs/tree/v1.2.2
 [1.3.0]: https://github.com/haskell-game/dear-imgui.hs/tree/v1.3.0