Python 3.5 compatibility.

Author: clokep

synapse/logging/_remote.py

@@ -19,9 +19,10 @@
 from collections import deque
 from ipaddress import IPv4Address, IPv6Address, ip_address
 from math import floor
-from typing import Deque, Optional
+from typing import Optional
 
 import attr
+from typing_extensions import Deque
 from zope.interface import implementer
 
 from twisted.application.internet import ClientService