move Friends mixin to builtins

steam/client/builtins/__init__.py

@@ -7,8 +7,9 @@ from steam.client.builtins.web import Web
 from steam.client.builtins.unified_messages import UnifiedMessages
 from steam.client.builtins.leaderboards import Leaderboards
 from steam.client.builtins.gameservers import GameServers
+from steam.client.builtins.friends import Friends
 
-class BuiltinBase(Misc, User, Web, UnifiedMessages, Leaderboards, GameServers):
+class BuiltinBase(Misc, User, Web, UnifiedMessages, Leaderboards, GameServers, Friends):
     """
     This object is used as base to implement all high level functionality.
     The features are separated into submodules.