Fix stale websockets, breaking connector.stop()

+ fixes (sousa-andre#18)
+ Each WebSocket registered by the user is now stored in a list called self.connections. This allows us to iterate over each stored connection object later when the connector.stop() method is called. By unregistering each connection, the method can successfully close the connections as intended. This prevents the occurrence of an infinite loop, which could happen if the @connector.ws.register() decorator was used to register a connection before

lcu_driver/connector.py

@@ -35,12 +35,15 @@ class Connector(BaseConnector):
     def __init__(self, *, loop=None):
         super().__init__(loop)
         self._repeat_flag = True
+        self.connections = []
         self.connection = None
 
     def register_connection(self, connection):
+        self.connections.append(self)
         self.connection = connection
 
     def unregister_connection(self, _):
+        self.connections.remove(self)
         self.connection = None
 
     @property
@@ -78,6 +81,11 @@ async def stop(self) -> None:
         :rtype: None
         """
         self._repeat_flag = False
+
+        # close user-registered connections first, so listening to stale websockets won't cause an infinite loop
+        for e in self.connections:
+            self.unregister_connection(e)
+
         if self.connection is not None:
             await self.connection._close()