use new collections MutableMutex

diff --git a/requests/packages/urllib3/_collections.py b/requests/packages/urllib3/_collections.py
index e73f0ed4abc8849ed4baf4f17b1949ac63f3dee9..912c8666ac3d1a5bf5fea9ecdedde96a6943904b 100755 (executable)
--- a/requests/packages/urllib3/_collections.py
+++ b/requests/packages/urllib3/_collections.py
@@ -4,10 +4,12 @@
 # This module is part of urllib3 and is released under
 # the MIT License: http://www.opensource.org/licenses/mit-license.php
 
-from collections import deque, MutableMapping
 
+from collections import deque
 from threading import RLock
 
+from .__collections import MutableMapping
+
 __all__ = ['RecentlyUsedContainer']