Update CHANGELOG.md

CHANGELOG.md

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 # Changelog
 
+## 2.0.1
+
+Bugfixes
+
+- SDL2 window now allows highdpi framebuffers when available
+- pygame2 window should only initialize the display module
+
 ## 2.0.0
 
 Breaking Changes
+
 * `mouse_position_event` signature has changed from `(x, y)` to `(x, y, dx, dy)`.
   This means you will also be getting the relative position change.
 * `mouse_drag_event` signature has changed from `(x, y)` to `(x, y, dx, dy)`.
   This means you will also be getting the relative position change.
 * `KeyboardCamera.rot_state` now takes dx and dy instead of x and y
 
 Improvements
+
 * Python 3.8 support (PySide2 will take a few more months. SDL2 has issues on windows)
 * Added pygame2 window
 * Added window callback `iconify` for all window types that will be called