Bump aiohttp requirement and fix AsyncWebhookAdapter

discord/webhook.py

@@ -141,7 +141,7 @@ class AsyncWebhookAdapter(WebhookAdapter):
 
     def __init__(self, session):
         self.session = session
-        self.loop = session.loop
+        self.loop = asyncio.get_event_loop()
 
     async def request(self, verb, url, payload=None, multipart=None):
         headers = {}

requirements.txt

@@ -1,2 +1,2 @@
-aiohttp>=3.3.0,<3.5.0
+aiohttp>=3.3.0,<3.6.0
 websockets>=6.0,<7.0