fix linter warnings

meshtastic/observable.py

@@ -10,7 +10,7 @@ class Event:
 
     def __getattr__(self, name: str) -> typing.Any:
         """We dynamically add attributes to this class, so stub out __getattr__ so that mypy doesn't complain."""
-        pass
+
 
 class Observable:
     """A class that represents an observable object.

meshtastic/powermon/__init__.py

@@ -1 +1,3 @@
-from .riden import *
+"""Support for logging from power meters/supplies."""
+
+from .riden import *

meshtastic/powermon/riden.py

@@ -55,4 +55,3 @@ class RidenPowerSupply(PowerSupply):
         """Get the current watt-hour reading."""
         self.r.update()
         return self.r.wh
-