change bytearray to WriteableBuffer per review comment

Author: tcfranks

adafruit_l3gd20.py

@@ -40,6 +40,7 @@
     from typing import Tuple
     from digitalio import DigitalInOut
     from busio import I2C, SPI
+    from circuitpython_typing import WriteableBuffer
 except ImportError:
     pass
 
@@ -358,7 +359,7 @@ def read_register(self, register: int) -> int:
             # print("$%02X => %s" % (register, [hex(i) for i in self._spi_bytearray1]))
             return self._spi_bytearray1[0]
 
-    def read_bytes(self, register: int, buffer: bytearray) -> None:
+    def read_bytes(self, register: int, buffer: WriteableBuffer) -> None:
         """
         Low level register stream reading over SPI, returns a list of values
 

requirements.txt

@@ -4,3 +4,4 @@
 
 Adafruit-Blinka
 adafruit-circuitpython-register
+adafruit-circuitpython-typing