change the i2c init to just read 1 byte

it is not needed to read more than 1 byte just
to verify that the i2c device is present

Author: pdp7

adafruit_bus_device/i2c_device.py

@@ -64,7 +64,7 @@ def __init__(self, i2c, device_address):
         while not i2c.try_lock():
             pass
         try:
-            result = bytearray(2)
+            result = bytearray(1)
             i2c.readfrom_into(device_address, result)
         except OSError:
             raise ValueError("No I2C device at address: %x" % device_address)