add sync timeout

this prevents us spamming the server with sync requests

scrape.py

@@ -118,7 +118,8 @@ async def main():
 
     while True:
         # do sync first to e.g. accept an admin room invite
-        sync = await matrix.sync(sync_filter=sync_filter)
+        sync = await matrix.sync(timeout=30000, sync_filter=sync_filter)
+        print('last sync: '+datetime.now())
         for room_id in sync.rooms.invite:
             print('joining '+room_id)
             await matrix.join(room_id)