Set force_update to true for mysensors sensors (home-assistant#3648)

homeassistant/components/sensor/mysensors.py

@@ -85,6 +85,15 @@ def setup_platform(hass, config, add_devices, discovery_info=None):
 class MySensorsSensor(mysensors.MySensorsDeviceEntity, Entity):
     """Representation of a MySensors Sensor child node."""
 
+    @property
+    def force_update(self):
+        """Return True if state updates should be forced.
+
+        If True, a state change will be triggered anytime the state property is
+        updated, not just when the value changes.
+        """
+        return True
+
     @property
     def state(self):
         """Return the state of the device."""