convert "!= None "to "is not None"

Author: whogben

adafruit_vl53l0x.py

@@ -573,7 +573,7 @@ def read_range(self, max_ready_wait_us = None):
                 and (time.monotonic() - start) >= self.io_timeout_s
             ):
                 raise RuntimeError("Timeout waiting for VL53L0X!")
-            if max_ready_wait_us != None and (time.monotonic() - start)*1_000_000 >= max_ready_wait_us:
+            if max_ready_wait_us is not None and (time.monotonic() - start)*1_000_000 >= max_ready_wait_us:
                 return -1
         # assumptions: Linearity Corrective Gain is 1000 (default)
         # fractional ranging is not enabled