Linting.

Author: kattni

adafruit_74hc595.py

@@ -108,7 +108,7 @@ def direction(self, val):  # pylint: disable=no-self-use
     @property
     def pull(self):
         """Pull-up/down not supported, return None for no pull-up/down."""
-        return digitalio.Pull.NONE
+        return None
 
     @pull.setter
     def pull(self, val):  # pylint: disable=no-self-use