Merge pull request #14 from FoamyGuy/root_group_update

update show to root_group

Author: tannewt

examples/tca8418_3x4_OLED.py

@@ -52,7 +52,7 @@
 display = adafruit_displayio_ssd1306.SSD1306(display_bus, width=WIDTH, height=HEIGHT)
 
 splash = displayio.Group()
-display.show(splash)
+display.root_group = splash
 
 # text area setup
 title_text = "TCA8418 Demo"