Merge pull request #40 from prcutler/root-group-fix

Update to use display.root_group for CP 9 compatibility

Author: dhalbert

adafruit_pyoa.py

@@ -92,7 +92,7 @@ def __init__(self) -> None:
         except AttributeError:
             pass
         self.backlight_fade(0)
-        self._display.show(self.root_group)
+        self._display.root_group = self.root_group
         self.touchscreen = None
         self.mouse_cursor = None
         if hasattr(board, "TOUCH_XL"):