Fixes issue 17 - sleep() throws error

b"" does not pass properly to the i2cdisplay function as it tries to concatenate a list with a byte string.

Author: dargus

adafruit_displayio_sh1106.py

@@ -108,13 +108,13 @@ def sleep(self) -> None:
             4) The MP can access (update) the built-in display RAM
         """
         if self._is_awake:
-            self.bus.send(0xAE, b"")  # 0xAE = display off, sleep mode
+            self.bus.send(0xAE, [0x00])  # 0xAE = display off, sleep mode
             self._is_awake = False
 
     def wake(self) -> None:
         """
         Wake display from sleep mode
         """
         if not self._is_awake:
-            self.bus.send(0xAF, b"")  # 0xAF = display on
+            self.bus.send(0xAF, [0x00])  # 0xAF = display on
             self._is_awake = True