Small doc addition

Author: EvieePy

wavelink/client.py

@@ -201,6 +201,9 @@ def get_player(self, guild_id: int, *, cls=None, node_id=None) -> Player:
             The given ID does not yield a valid guild or Node.
         ZeroConnectedNodes
             There are no :class:`wavelink.node.Node`'s currently connected.
+
+        .. versionchanged:: 0.3.0
+            cls is now a keyword only argument.
         """
         players = self.players