run: pass app instance to EventDispatcher

this should help with future DM channel pub/sub, as we'll
have to query the `dm_channel_state` table.

litecord/dispatcher.py

@@ -11,8 +11,9 @@ log = Logger(__name__)
 
 class EventDispatcher:
     """Pub/Sub routines for litecord."""
-    def __init__(self, sm):
-        self.state_manager = sm
+    def __init__(self, app):
+        self.state_manager = app.state_manager
+        self.app = app
 
         self.backends = {
             'guild': GuildDispatcher(self),

litecord/pubsub/dispatcher.py

@@ -11,6 +11,7 @@ class Dispatcher:
     def __init__(self, main):
         self.main_dispatcher = main
         self.sm = main.state_manager
+        self.app = main.app
 
     async def sub(self, _key, _id):
         raise NotImplementedError

run.py

@@ -93,9 +93,9 @@ async def app_before_serving():
     g.loop = asyncio.get_event_loop()
 
     app.state_manager = StateManager()
-    app.dispatcher = EventDispatcher(app.state_manager)
-
     app.storage = Storage(app.db)
+
+    app.dispatcher = EventDispatcher(app)
     app.presence = PresenceManager(app.storage,
                                    app.state_manager, app.dispatcher)
     app.storage.presence = app.presence