Short read fix.

fix.patch

commit ebef3775f0ab40820f5a118b632d5e1f0c7d1121
Author: Cory Benfield <lukasaoz@gmail.com>
Date:   Mon Apr 24 17:23:29 2017 +0100

    Read short on EOF

diff --git a/urllib3/contrib/securetransport.py b/urllib3/contrib/securetransport.py
index 84d213f..cd840a6 100644
--- a/urllib3/contrib/securetransport.py
+++ b/urllib3/contrib/securetransport.py
@@ -517,6 +517,10 @@ class WrappedSocket(object):
         return data
 
     def recv_into(self, buffer, nbytes=None):
+        # Read short on EOF.
+        if self._closed:
+            return 0
+
         if nbytes is None:
             nbytes = len(buffer)