Upgrade pylint to 2.1.0 (#15811)

* Upgrade pylint to 2.1.0

* Remove no longer needed pylint disables

homeassistant/components/binary_sensor/bayesian.py

@@ -122,7 +122,6 @@ class BayesianBinarySensor(BinarySensorDevice):
     def async_added_to_hass(self):
         """Call when entity about to be added."""
         @callback
-        # pylint: disable=invalid-name
         def async_threshold_sensor_state_listener(entity, old_state,
                                                   new_state):
             """Handle sensor state changes."""

homeassistant/components/binary_sensor/threshold.py

@@ -86,7 +86,6 @@ class ThresholdSensor(BinarySensorDevice):
         self._state = False
         self.sensor_value = None
 
-        # pylint: disable=invalid-name
         @callback
         def async_threshold_sensor_state_listener(
                 entity, old_state, new_state):