Add/update missing property, update set_relay_lock typing

Author: bouwew

plugwise_usb/api.py

@@ -377,6 +377,13 @@ def relay(self) -> bool:
         Raises NodeError when relay feature is not present at device.
         """
 
+    @property
+    def relay_lock(self) -> RelayLock:
+        """Last known relay lock state information.
+
+        Raises NodeError when relay lock feature is not present at device.
+        """
+
     @property
     def relay_state(self) -> RelayState:
         """Last known relay state information.

plugwise_usb/nodes/circle.py

@@ -183,12 +183,13 @@ def relay_lock(self) -> RelayLock:
         """State of the relay lock."""
         return self._relay_lock
 
-    async def set_relay_lock(self, state: bool) -> RelayLock:
+    async def set_relay_lock(self, state: bool) -> bool:
         """Set the state of the relay-lock."""
         await self._relay_update_lock(state)
         await self.publish_feature_update_to_subscribers(
             NodeFeature.RELAY_LOCK, state
         )
+        return state
 
     # endregion