Fix ModuleNotFoundError: No module named 'displayio'

The 'displayio' module is not used since the examples in this
repository implement the adafruit_framebuf interface.

Author: waynedyck

examples/ssd1306_simpletest.py

@@ -5,11 +5,8 @@
 # This example and library is meant to work with Adafruit CircuitPython API.
 
 import board
-import displayio
 import adafruit_ssd1306
 
-displayio.release_displays()
-
 # Create the I2C bus interface.
 i2c = board.I2C()  # uses board.SCL and board.SDA
 # i2c = busio.I2C(board.GP1, board.GP0)    # Pi Pico RP2040