Fixing the deprecation

KOLANICH · KOLANICH · commit db85baf9b02e · 2021-04-29T15:20:52.000+03:00
diff --git a/hyper/http11/connection.py b/hyper/http11/connection.py
@@ -10,7 +10,7 @@
 import socket
 import base64
 
-from collections import Iterable, Mapping
+from collections.abc import Iterable, Mapping
 
 import collections
 from hyperframe.frame import SettingsFrame
